INSERT INTO `questions` (`id`, `category_id`, `question`, `question_type`, `answer_type`, `subjective_ans`, `marks`, `time`, `added_by`, `status`, `current_url`, `created_at`, `updated_at`) VALUES
(250958, '85,80,201,239', '<p>Enthalpy change for the reaction,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mn>4</mn><mi mathvariant=\"normal\">H</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mi>is</mi><mo>&#160;</mo><mo>-</mo><mn>869</mn><mo>.</mo><mn>6</mn><mo>&#160;</mo><mi>kJ</mi></math></p>\r\n\r\n<p>The dissociation energy of H - H bond is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:15:02', NULL),
(250959, '85,80,201,239', '<p>Standard entropies of<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>X</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>Y</mi><mn>2</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>X</mi><msub><mi>Y</mi><mn>3</mn></msub></math>&nbsp;are 60, 40 and 50 J&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>&#160;</mo><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;respectively. For the reaction</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mn>1</mn><mo>/</mo><mn>2</mn><msub><mi mathvariant=\"normal\">X</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>3</mn><mo>/</mo><mn>2</mn><mo>&#160;</mo><msub><mi mathvariant=\"normal\">Y</mi><mn>2</mn></msub><mo>&#160;</mo><mo>&#8652;</mo><msub><mi>XY</mi><mn>3</mn></msub><mo>,</mo><mo>&#160;</mo><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>30</mn><mo>&#160;</mo><mi>kJ</mi></math>,</p>\r\n\r\n<p>to be at equilibrium, the temperature should be:&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:17:03', NULL),
(250960, '85,80,201,239', '<p>Identify the state quantity among the following:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:19:19', NULL),
(250961, '85,80,201,239', '<p>Which one of the following statements is false?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:20:25', NULL),
(250962, '85,80,201,239', '<p>In thermodynamics, a process is called reversible, when:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:21:31', NULL),
(250963, '85,80,201,239', '<p>If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:24:00', NULL),
(250964, '85,80,201,239', '<p>A heat engine absorbs heat&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>Q</mi><mn>1</mn></msub></math>&nbsp;at temperature&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>T</mi><mn>1</mn></msub></math>&nbsp;and heat&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>Q</mi><mn>2</mn></msub></math>&nbsp;at temperature&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>T</mi><mn>2</mn></msub></math>. Work done by the engine is&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>J</mi><mo>(</mo><msub><mi>Q</mi><mn>1</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>Q</mi><mn>2</mn></msub><mo>)</mo></math>. This data:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:26:21', NULL),
(250965, '85,80,201,239', '<p>One mole of a non-ideal gas undergoes a change of state (2.0 atm, 3.0 L, 95 K)&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo>&#8594;</mo></math>(4.0 atm, 5.0 L, 245 K) with a change in internal energy,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo></math>U = 30.0 L atm. The change in enthalpy&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mrow><mo>&#8710;</mo><mi>H</mi></mrow></mfenced></math>&nbsp;of the process in L atm is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:28:31', NULL),
(250966, '85,80,201,239', '<p>The van&#39;t Hoff reaction isotherm is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:29:34', NULL),
(250967, '85,80,201,239', '<p>If liquids A and B form an ideal solution, the:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:31:06', NULL),
(250968, '85,80,201,239', '<p>In an irreversible process taking place at constant T and P and in which only PV work is being done, the change in free energy (dG) and change in entropy (dS) satisfy the criteria:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:33:00', NULL),
(250969, '85,80,201,239', '<p>The internal energy change when a system goes from state A to B is 40 kJ/mol. If the system goes from A to B by a reversible path and returns to state A by an irreversible path. What would be the net change in internal energy?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:34:15', NULL),
(250970, '85,80,201,239', '<p>The enthalpy of vaporisation of liquid is 30 kJ<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;and&nbsp;entropy of vaporisation is 75 JK&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. The b.pt of liquid at 1 atm is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:35:37', NULL),
(250971, '85,80,201,239', '<p>At 1 atm pressure,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo>&#8710;</mo><mi>S</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>75</mn><mo>&#160;</mo><mi>J</mi><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>;&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo>&#8710;</mo><mi>H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>30</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi><mo>&#160;</mo><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. The temperature of the reaction at equilibrium is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:36:41', NULL),
(250972, '85,80,201,239', '<p>For a reversible process at T = 300 K, the volume of 2 mole of ideal gas is increased from 1 litre to 10 litre, the&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo></math>H for isothermal change is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:37:53', NULL),
(250973, '85,80,201,239', '<p>An ideal gas expands in volume from&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mn>10</mn><mrow><mo>-</mo><mn>3</mn></mrow></msup><msup><mi>m</mi><mn>3</mn></msup><mo>&#160;</mo><mi>t</mi><mi>o</mi><mo>&#160;</mo><msup><mn>10</mn><mrow><mo>-</mo><mn>2</mn></mrow></msup><msup><mi>m</mi><mn>3</mn></msup></math>&nbsp;at 300 K against a constant pressure of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mn>10</mn><mn>5</mn></msup><mo>&#160;</mo><mi>N</mi><msup><mi>m</mi><mrow><mo>-</mo><mn>2</mn></mrow></msup></math>. The work done is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 08:39:10', NULL),
(250974, '85,80,201,239', '<p>Standard enthalpy and standard entropy change for the oxidation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub></math>&nbsp;at 298K are -382.64 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;and -145.6 J&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;respectively. Standard free energy change for the same reaction at 298 K is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 09:28:51', NULL),
(250975, '85,80,201,239', '<p>Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 09:29:56', NULL),
(250976, '85,80,201,239', '<p>When one mole of monoatomic ideal gas at TK undergoes reversible adiabatic change under a constant external pressure of 1 atm changes volume from 1 litre to 2 litre. The final temperature in kelvin in would be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 09:32:27', NULL),
(250977, '85,80,201,239', '<p>For a spontaneous reaction&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">G</mi></math>, equilibrium constant (K) and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi mathvariant=\"normal\">E</mi><mi>cell</mi><mo>&#176;</mo></msubsup></math>&nbsp;will be respectively:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 09:33:48', NULL),
(250978, '85,80,201,239', '<p>An ideal gas is allowed to expand both reversible and irreversibly in an isolated system. If&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>T</mi><mi>i</mi></msub></math>&nbsp;is the initial temperature and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>T</mi><mi>f</mi></msub></math>&nbsp;is the final temperature, which of the following statements is correct?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 09:36:40', NULL),
(250979, '85,80,201,239', '<p>The enthalpy and entropy change for the reaction,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi><msub><mi>r</mi><mn>2</mn></msub><mo>(</mo><mi>l</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><mi>B</mi><mi>r</mi><mi>C</mi><mi>l</mi><mfenced><mi>g</mi></mfenced></math></p>\r\n\r\n<p>are 30 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mn>105</mn><mo>&#160;</mo><mi>J</mi><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;respectively. The temperature at which the reaction will be in equilibrium is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 09:38:19', NULL),
(250980, '85,80,201,239', '<p>The direct conversion of A to B is difficult and thus it is converted by path&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>A</mi><mo>&#160;</mo><mo>&#8594;</mo><mi>C</mi><mo>&#8594;</mo><mi>D</mi><mo>&#8594;</mo><mi>B</mi></math>. Given&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><msub><mi>S</mi><mrow><mi mathvariant=\"normal\">A</mi><mo>&#8594;</mo><mi mathvariant=\"normal\">C</mi></mrow></msub><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>50</mn><mo>&#160;</mo><mi>e</mi><mo>.</mo><mi>u</mi><mo>;</mo><mo>&#160;</mo><mo>&#8710;</mo><msub><mi>S</mi><mrow><mi mathvariant=\"normal\">C</mi><mo>&#8594;</mo><mi mathvariant=\"normal\">D</mi></mrow></msub><mo mathvariant=\"italic\">&#160;</mo><mo mathvariant=\"italic\">=</mo><mo mathvariant=\"italic\">&#160;</mo><mn mathvariant=\"italic\">30</mn><mo mathvariant=\"italic\">&#160;</mo><mi>e</mi><mo mathvariant=\"italic\">.</mo><mi>u</mi><mo mathvariant=\"italic\">;</mo><mo mathvariant=\"italic\">&#160;</mo><mo>&#8710;</mo><msub><mi>S</mi><mrow><mi mathvariant=\"italic\">B</mi><mo mathvariant=\"italic\">&#8594;</mo><mi mathvariant=\"italic\">D</mi></mrow></msub><mo mathvariant=\"italic\">&#160;</mo><mo mathvariant=\"italic\">=</mo><mo mathvariant=\"italic\">&#160;</mo><mn mathvariant=\"italic\">20</mn><mo mathvariant=\"italic\">&#160;</mo><mi>e</mi><mo mathvariant=\"italic\">.</mo><mi>u</mi></math></p>\r\n\r\n<p>Where e.u. is the entropy unit, then&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><msub><mi mathvariant=\"normal\">S</mi><mrow><mi mathvariant=\"normal\">A</mi><mo>&#8594;</mo><mi mathvariant=\"normal\">B</mi></mrow></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 09:40:41', NULL),
(250981, '85,80,201,239', '<p>Given that&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><msub><mi mathvariant=\"normal\">H</mi><mi mathvariant=\"normal\">r</mi></msub><mo>&#160;</mo><mn>298</mn><mo>&#160;</mo><mi mathvariant=\"normal\">K</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>54</mn><mo>.</mo><mn>07</mn><mo>&#160;</mo><mi>kJ</mi><mo>&#160;</mo><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>&#160;</mo><mi>and</mi><mo>&#160;</mo><mo>&#8710;</mo><msubsup><mi mathvariant=\"normal\">S</mi><mrow><mi mathvariant=\"normal\">r</mi><mo>&#160;</mo><mn>298</mn><mi mathvariant=\"normal\">K</mi></mrow><mo>&#176;</mo></msubsup><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>10</mn><mo>&#160;</mo><mi mathvariant=\"normal\">J</mi><mo>&#160;</mo><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;and R = 8.314&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>J</mi><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. The value of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>log</mi><mn>10</mn></msub></math>K for a rection, A&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8652;</mo></math>B is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 09:43:06', NULL),
(250982, '85,80,201,239', '<p>The correct statement regarding a spontaneous process is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 09:44:48', NULL),
(250983, '85,80,201,239', '<p>For the process:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>(</mo><mi mathvariant=\"normal\">l</mi><mo>)</mo><mo>&#160;</mo><mfenced open=\"[\" close=\"]\"><mrow><mn>1</mn><mo>&#160;</mo><mi>bar</mi><mo>,</mo><mo>&#160;</mo><mn>373</mn><mo>&#160;</mo><mi mathvariant=\"normal\">K</mi></mrow></mfenced><mo>&#8594;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>[</mo><mn>1</mn><mo>&#160;</mo><mi>bar</mi><mo>,</mo><mo>&#160;</mo><mn>373</mn><mo>&#160;</mo><mi mathvariant=\"normal\">K</mi><mo>]</mo><mo>&#160;</mo></math>&nbsp;the correct set of thermodynamic parameters are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 09:47:07', NULL),
(250984, '85,80,201,239', '<p>In the conversion of limestone to lime:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>a</mi><mi>C</mi><msub><mi>O</mi><mn>3</mn></msub><mo>(</mo><mi>s</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mi>C</mi><mi>a</mi><mi>O</mi><mo>(</mo><mi>s</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math></p>\r\n\r\n<p>The values of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><msup><mi mathvariant=\"normal\">H</mi><mo>&#176;</mo></msup></math>&nbsp;and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><msup><mi mathvariant=\"normal\">S</mi><mo>&#176;</mo></msup></math>&nbsp;are 179.1 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mn>160</mn><mo>.</mo><mn>2</mn><mo>&#160;</mo><mi>J</mi><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;respectively at 298 K and 1 bar. Assuming&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><msup><mi mathvariant=\"normal\">H</mi><mo>&#176;</mo></msup></math>&nbsp;and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><msup><mi mathvariant=\"normal\">S</mi><mo>&#176;</mo></msup></math>&nbsp;remains constant with temperature, at which temperature conversion of limestone to lime will be spontaneous:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 09:49:14', NULL),
(250985, '85,80,201,239', '<p>Standard entropy&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>X</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>Y</mi><mn>2</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>X</mi><msub><mi>Y</mi><mn>3</mn></msub></math>&nbsp;are 60, 40 and 50&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>J</mi><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>, respectively. For the reaction,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfrac><mn>1</mn><mn>2</mn></mfrac><msub><mi>X</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mfrac><mn>3</mn><mn>2</mn></mfrac><msub><mi>Y</mi><mn>2</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><mi>X</mi><msub><mi>Y</mi><mn>3</mn></msub><mo>,</mo><mo>&#160;</mo><mo>&#8710;</mo><mi>H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo></math>-30kJ, to be at equilibrium, the temperature will be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 09:50:59', NULL),
(250986, '85,80,201,239', '<p>For a particular reversible reaction at temperature T,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo></math>H and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">S</mi></math>&nbsp;were found to be +ve. If&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>T</mi><mi>e</mi></msub></math>&nbsp;is the temperature at equilibrium, the reaction would be spontaneous when:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 09:52:32', NULL),
(250987, '85,80,201,239', '<p>The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>d</mi><msup><mi>m</mi><mn>3</mn></msup></math>&nbsp;to a volume of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>100</mn><mo>&#160;</mo><mi>d</mi><msup><mi>m</mi><mn>3</mn></msup></math>&nbsp;at&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>27</mn><mo>&#176;</mo></msup></math>C is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 09:54:20', NULL),
(250988, '85,80,201,239', '<p>In view of the signs of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mo>&#8710;</mo><mi mathvariant=\"normal\">r</mi></msub><msup><mi>G</mi><mo>&#176;</mo></msup></math>&nbsp;for the following reactions</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>P</mi><mi>b</mi><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>P</mi><mi>b</mi><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><mi>P</mi><mi>b</mi><mi>O</mi><mo>,</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><msub><mo>&#8710;</mo><mi>r</mi></msub><msup><mi>G</mi><mo>&#8728;</mo></msup><mo>&#60;</mo><mn>0</mn><mspace linebreak=\"newline\"/><mi>S</mi><mi>n</mi><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>S</mi><mi>n</mi><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><mi>S</mi><mi>n</mi><mi>O</mi><mo>,</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><msub><mo>&#8710;</mo><mi>r</mi></msub><msup><mi>G</mi><mo>&#8728;</mo></msup><mo>&#62;</mo><mn>0</mn></math></p>\r\n\r\n<p>which oxidation states are more characteristic for lead and tin?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 09:57:08', NULL),
(250989, '85,80,201,239', '<p>The incorrect expression among the following is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:00:57', NULL),
(250990, '85,80,201,239', '<p>A piston filled with 0.04 mole of an ideal gas expands reversible from 50.0 mL to 375 mL at a constant temperature of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mn>37</mn><mo>.</mo><msup><mn>0</mn><mo>&#176;</mo></msup></math>C&nbsp;. As it does so, it absorbs 208 J of heat. The values of q and w for the process will be:</p>\r\n\r\n<p>(R = 8.314 J/mol K) (In 7.5 = 2.01)</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:04:58', NULL),
(250991, '85,80,201,239', '<p>For the process</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>l</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>g</mi><mo>)</mo></math></p>\r\n\r\n<p>at T =&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>100</mn><mo>&#176;</mo></msup></math>C and 1 atmosphere pressure, the correct choice is:</p>\r\n\r\n<p>&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:07:03', NULL),
(250992, '85,80,201,239', '<p>One mole of an idel gas at 300 K in thermal contact with surroundings expands isothermally from 1.0 L to 2.0 L against a constant pressure of 3.0 atm. In this process, the change in entropy of surroundings&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mrow><mo>&#8710;</mo><msub><mi>S</mi><mrow><mi>s</mi><mi>u</mi><mi>r</mi><mi>r</mi></mrow></msub></mrow></mfenced></math>&nbsp;in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>J</mi><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;is:</p>\r\n\r\n<p>(1 L atm = 101.3 J)</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:08:37', NULL),
(250993, '85,80,201,239', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">U</mi></math>&nbsp;is equal to</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:09:07', NULL),
(250994, '85,80,201,239', '<p>Which of the following equations does not correctly represents the first law of thermodynamics for the given process involving ideal gas (Assume non-expansion work is zero)?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:10:53', NULL),
(250995, '85,80,201,239', '<p>Five moles of an ideal gas at 100 K are allowed to undergo reversible compression till its temperature becomes 200 K. If&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>C</mi><mi>v</mi></msub><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>28</mn><mo>&#160;</mo><mi>J</mi><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>,</mo></math>&nbsp;calculate&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo></math>U and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo></math>PV for this process in. (R = 8&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>J</mi><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>&#160;</mo><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>)</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:13:42', NULL),
(250996, '85,80,201,239', '<p>Among the following, the set of parameters that represents path functions are:</p>\r\n\r\n<p>(i) q + w&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;(ii) q&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (iii) w&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (iv) H - TS</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:14:43', NULL),
(250997, '85,80,201,239', '<p>During compression of a spring, the work done is 10 kJ and 2 kJ is escaped to the surroundings as heat. The change in internal energy,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo></math>U (in kJ) is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:15:45', NULL),
(250998, '85,80,201,239', '<p>A process will be spontaneous at all temperatures if, :</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:19:07', NULL),
(250999, '85,80,201,239', '<p>An ideal gas is allowed to expand from 1L to 10L against a constant pressure of 1 bar. The work doe in kJ is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:19:48', NULL),
(251000, '85,80,201,239', '<p>The incorrect match in the following is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:22:46', NULL),
(251001, '85,80,201,239', '<p>The entropy change associated with the conversion of 1 kg of ice at 273 K to water vapours at 383 K is:</p>\r\n\r\n<p>Given specific heat of liquid water and water vapours are 4.2 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mi>k</mi><msup><mi>g</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mn>2</mn><mo>.</mo><mn>0</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi><mo>&#160;</mo><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mi>k</mi><msup><mi>g</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;and 2491&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>k</mi><msup><mi>g</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;respectively: In 373 = 2.572, In 273 = 2.436 and In 383 = 2.583</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:25:48', NULL),
(251002, '85,80,201,239', '<p>A process has&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>200</mn><mo>&#160;</mo><mi mathvariant=\"normal\">J</mi><mo>&#160;</mo><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>&#160;</mo><mi>and</mi><mo>&#160;</mo><mo>&#8710;</mo><mi mathvariant=\"normal\">S</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>40</mn><mo>&#160;</mo><mi mathvariant=\"normal\">J</mi><mo>&#160;</mo><msup><mi mathvariant=\"normal\">K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. Out of the values given below, choose the minimum temperature above which the process willl be spontaneous:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:27:07', NULL),
(251003, '85,80,201,239', '<p>An ideal gas undergoes isothermal compression from 5<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>m</mi><mn>3</mn></msup><mi>t</mi><mi>o</mi><mo>&#160;</mo><mn>1</mn><mo>&#160;</mo><msup><mi>m</mi><mn>3</mn></msup></math>&nbsp;against a constant pressure of 4&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msup><mi>m</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. Heat released in this process is used to increase the temperature of 1 mole of Al. If molar heat capacity of Al is 24 J&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><msup><mi mathvariant=\"normal\">K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>, the temperature of Al increases Al increases by:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:29:06', NULL),
(251004, '85,80,201,239', '<p>The process with negative entropy change is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:30:29', NULL),
(251005, '85,80,201,239', '<p>For the chemical reaction, x&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8652;</mo></math>y, the standard reaction&nbsp;</p>\r\n\r\n<p>Gibbs energy change depends on temperature in (K) as</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo>&#8710;</mo><mi mathvariant=\"normal\">G</mi><mo>(</mo><mi>in</mi><mo>&#160;</mo><mi>kJ</mi><mo>&#160;</mo><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>)</mo><mo>&#160;</mo><mo>=</mo><mn>120</mn><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mfrac><mrow><mn>3</mn><mi>T</mi></mrow><mn>8</mn></mfrac></math></p>\r\n\r\n<p>The major component of the reaction mixture, T is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:32:39', NULL),
(251006, '85,80,201,239', '<p>Two blocks of the same metal having same mass and at temperature&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>T</mi><mn>1</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>T</mi><mn>2</mn></msub></math>&nbsp;respectively are brought in contact with each other and allowed to attain thermal equilibrium at constant pressure.The change in entropy,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo></math>S for the process is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:36:57', NULL),
(251007, '85,80,201,239', '<p>For the equilibrium :&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mn>2</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>&#160;</mo><mo>&#8652;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><msup><mi mathvariant=\"normal\">O</mi><mo>+</mo></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msup><mi>OH</mi><mo>-</mo></msup></math>, the value of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><msup><mi mathvariant=\"normal\">G</mi><mo>&#176;</mo></msup></math>&nbsp;and 298 K is approximately:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:38:54', NULL),
(251008, '85,80,201,239', '<p>The reaction:&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>MgO</mi><mrow><mo>(</mo><mi mathvariant=\"normal\">s</mi><mo>)</mo></mrow></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">C</mi><mfenced><mi mathvariant=\"normal\">s</mi></mfenced></msub><mo>&#160;</mo><mo>&#8594;</mo><msub><mi>Mg</mi><mfenced><mi mathvariant=\"normal\">s</mi></mfenced></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>CO</mi><mfenced><mi mathvariant=\"normal\">g</mi></mfenced></msub></math>&nbsp;;</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mo>&#8710;</mo><mi mathvariant=\"normal\">r</mi></msub><mo>&#160;</mo><mi>H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>491</mn><mo>.</mo><mn>1</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi><mo>&#160;</mo><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. If&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">S</mi></math>&nbsp;is 198.0 J&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>, the reaction is not feasible at 298 K. At what temperature reaction will be possible:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:41:48', NULL),
(251009, '85,80,201,239', '<p>The Gibbs energy change for a chemical reaction at absolute temperature T is given by&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo></math>G = A - BT, where A and B are non-zero constants. Which of the following is true about the reaction?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:43:29', NULL),
(251010, '85,80,201,239', '<p>The combination of plots which does not represent isothermal expansion of an ideal gas is:</p>\r\n\r\n<p><img alt=\"\" src=\"https://school.achievam.com/upload/questionbank/question/que_1755081864.png\" style=\"height:200px; width:235px\" /></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:45:01', NULL),
(251011, '85,80,201,239', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>A</mi><mfenced><mi>l</mi></mfenced><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><msub><mi>B</mi><mrow><mo>(</mo><mi>g</mi><mo>)</mo></mrow></msub></math></p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">U</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>2</mn><mo>.</mo><mn>1</mn><mo>&#160;</mo><mi>kcal</mi><mo>,</mo><mo>&#160;</mo><mo>&#8710;</mo><mi mathvariant=\"normal\">S</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>20</mn><mo>&#160;</mo><mi>cal</mi><mo>/</mo><mi mathvariant=\"normal\">K</mi><mo>,</mo><mo>&#160;</mo><mi mathvariant=\"normal\">T</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>300</mn><mo>&#160;</mo><mi mathvariant=\"normal\">K</mi></math></p>\r\n\r\n<p>The&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo></math>G for the reaction is kcal is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:46:24', NULL),
(251012, '85,80,201,239', '<p>A gas undergoes expansion according to the following graph. Calculate work done by the gas.</p>\r\n\r\n<p><img alt=\"\" src=\"https://school.achievam.com/upload/questionbank/question/que_1755082046.png\" style=\"height:120px; width:170px\" /></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:48:03', NULL),
(251013, '85,80,201,239', '<p>Select the correct option:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:52:19', NULL),
(251014, '85,80,201,239', '<p>Temperature of 4 moles of gas increases from 300 K to 500 K. Find &#39;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>C</mi><mi>v</mi></msub></math>&#39; if&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">U</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>5000</mn><mo>&#160;</mo><mi mathvariant=\"normal\">J</mi></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-13 10:54:22', NULL),
(251015, '85,80,201,239', '<p>The exchange of heat energy during chemical reaction at constant temperature and pressure occurs in form of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 08:40:55', NULL),
(251016, '85,80,201,239', '<p>Which plot represents for an exothermic reaction?</p>\r\n\r\n<p><img alt=\"\" src=\"https://school.achievam.com/upload/questionbank/question/que_1755160928.png\" style=\"height:222px; width:164px\" />&nbsp;<img alt=\"\" src=\"https://school.achievam.com/upload/questionbank/question/que_1755160946.png\" style=\"height:220px; width:153px\" /></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 08:42:40', NULL),
(251017, '85,80,201,239', '<p>Which value of heat of formation indicates that the product is the least stable?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 08:43:27', NULL),
(251018, '85,80,201,239', '<p>An exothermic reaction is one in which the reacting substances:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 08:44:30', NULL),
(251019, '85,80,201,239', '<p>For an endothermic reaction:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 08:45:26', NULL),
(251020, '85,80,201,239', '<p>For the reaction,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><mi>H</mi><mi>C</mi><mi>l</mi><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>x</mi><mn>1</mn></msub><mo>&#160;</mo><mi>k</mi><mi>J</mi><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>(</mo><mi>i</mi><mo>)</mo><mspace linebreak=\"newline\"/><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mn>2</mn><mi>H</mi><mi>C</mi><mi>l</mi><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#8594;</mo><msub><mi>H</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><msub><mi>x</mi><mn>2</mn></msub><mo>&#160;</mo><mi>k</mi><mi>J</mi><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>(</mo><mi>i</mi><mi>i</mi><mo>)</mo></math></p>\r\n\r\n<p>Which of the following statements is correct?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 08:47:43', NULL),
(251021, '85,80,201,239', '<p>Select the incorrect statement:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 08:49:00', NULL),
(251022, '85,80,201,239', '<p>The heats of neutralisation of four acids A, B, C and D are -13.7, -9.4, -11.2 and -12.4 kcal respectively when they are neutralised by a common base. The acidic character obeys the order.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 08:50:39', NULL),
(251023, '85,80,201,239', '<p>Heat energy change during the chemical reaction,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is known as:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 08:51:47', NULL),
(251024, '85,80,201,239', '<p>Which is correct about the heat of combustion?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 08:52:45', NULL),
(251025, '85,80,201,239', '<p>The standard heat of combustion of solid boron is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 08:54:16', NULL),
(251026, '85,80,201,239', '<p>The products of combustion of an aliphatic thiol (RSH) at 298 K are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 08:56:05', NULL),
(251027, '85,80,201,239', '<p>The word &#39;standard&#39; in standard molar enthalpy change implies:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 08:57:11', NULL),
(251028, '85,80,201,239', '<p>When 1g atom of carbon is converted into 1g molecule of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></math>, the heat liberated is same:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:04:46', NULL),
(251029, '85,80,201,239', '<p>The heat of formation&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><msub><mo>&#8710;</mo><mi>f</mi></msub></mfenced></math>&nbsp;of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>l</mi><mo>)</mo></math>&nbsp;is equal to</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:06:31', NULL),
(251030, '85,80,201,239', '<p>A gaseous reaction was carried out, first keeping the volume constant and next keeping the pressure constant. In the second experiment, there was an increase in volume. The heats of reaction were different, because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:08:30', NULL),
(251031, '85,80,201,239', '<p>Heat of neutralisation of HF is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:09:12', NULL),
(251032, '85,80,201,239', '<p>A positive change in enthalpy occurs in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:14:30', NULL),
(251033, '85,80,201,239', '<p>Which fuel provides the highest calorific value?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:15:05', NULL),
(251034, '85,80,201,239', '<p>The Kirchhoff&#39;s equation gives the effect of........on heat of reaction.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:15:38', NULL),
(251035, '85,80,201,239', '<p>The heat of formation is the change in enthalpy accompanying the formation of a substance from its elements at 298 K and 1 atm pressure. Since, the enthalpies of elements in their most stable state are taken to be zero, the heat of formation of compounds is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:17:28', NULL),
(251036, '85,80,201,239', '<p>The difference between heat of reaction at constant pressure and constant volume for the reaction given below at&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>25</mn><mo>&#176;</mo></msup><mi mathvariant=\"normal\">C</mi></math>&nbsp;in kJ is:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mn>2</mn><msub><mi mathvariant=\"normal\">C</mi><mn>6</mn></msub><msub><mi mathvariant=\"normal\">H</mi><mn>6</mn></msub><mo>(</mo><mi mathvariant=\"normal\">l</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>15</mn><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mn>12</mn><msub><mi>CO</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>6</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>(</mo><mi mathvariant=\"normal\">l</mi><mo>)</mo></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:18:52', NULL),
(251037, '85,80,201,239', '<p>Equl volume of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>C</mi><mn>2</mn></msub><msub><mi>H</mi><mn>2</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub></math>&nbsp;are combusted under identical condition. The ratio of their heat of combustion is:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><mo>&#8710;</mo><mi>H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>241</mn><mo>.</mo><mn>8</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi><mspace linebreak=\"newline\"/><msub><mi>C</mi><mn>2</mn></msub><msub><mi>H</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><mfrac><mn>1</mn><mn>2</mn></mfrac><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#8594;</mo><mo>&#160;</mo><mn>2</mn><mo>&#160;</mo><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><mo>&#8710;</mo><mi>H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>1300</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi><mo>&#160;</mo></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:21:11', NULL),
(251038, '85,80,201,239', '<p>If&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfrac><mn>1</mn><mn>2</mn></mfrac><msub><mi>X</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>s</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mi>X</mi><mo>(</mo><mi>s</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mfrac><mn>1</mn><mn>4</mn></mfrac><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>;</mo><mo>&#160;</mo><mo>&#8710;</mo><mi>H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>90</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi></math>, then heat change during reaction of metal &#39;X&#39; with one mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;to form oxide to maximum extent is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:22:50', NULL),
(251039, '85,80,201,239', '<p>The temperature of a 5 mL of strong acid increases by&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>5</mn><mo>&#176;</mo></msup></math>C when 5 mL of a strong base is added to it. If 10 mL of each are mixed, temperature should increase by:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:24:12', NULL);
INSERT INTO `questions` (`id`, `category_id`, `question`, `question_type`, `answer_type`, `subjective_ans`, `marks`, `time`, `added_by`, `status`, `current_url`, `created_at`, `updated_at`) VALUES
(251040, '85,80,201,239', '<p>If heat of neutralisation is -13.7 kcal and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi mathvariant=\"normal\">H</mi><mi mathvariant=\"normal\">f</mi><mo>&#176;</mo></msubsup><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>68</mn></math>&nbsp;kcal, then enthalpy of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>O</mi><msup><mi>H</mi><mo>-</mo></msup></math>&nbsp;would be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:25:20', NULL),
(251041, '85,80,201,239', '<p>Heat of combustion of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>C</mi><mn>2</mn></msub><msub><mi>H</mi><mn>4</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>C</mi><mn>2</mn></msub><msub><mi>H</mi><mn>6</mn></msub></math>&nbsp;are -890, -1411 and -1560 kJ/mol respectively. Which has the lowest calorific fuel value in kJ/g?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:26:44', NULL),
(251042, '85,80,201,239', '<p>Equal volume of 1M HCl and 1M&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;are neutralised by dilute NaOH solution and x and y kcal of heat are liberated respectively. Which of the following is true?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:28:02', NULL),
(251043, '85,80,201,239', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>l</mi><mo>)</mo><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><mo>&#8710;</mo><mi>H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>68</mn><mo>&#160;</mo><mi>k</mi><mi>c</mi><mi>a</mi><mi>l</mi></math>. the heat change, for the decompostion of 3.6g of water is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:29:04', NULL),
(251044, '85,80,201,239', '<p>A solution of 500 mL of 2M KOH is added to 500 mL of 2M HCl and the mixture is well shaken. The rise in temperature&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>T</mi><mn>1</mn></msub></math>&nbsp;is noted. The experiment is then repeated using 250 mL of each solution and rise in temperature&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>T</mi><mn>2</mn></msub></math>&nbsp;is again note. Assume all heat is taken up by the solution:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:32:16', NULL),
(251045, '85,80,201,239', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>l</mi><mo>)</mo><mo>;</mo><mo>&#160;</mo><mo>&#8710;</mo><msub><mi>H</mi><mrow><mn>298</mn><mi>K</mi></mrow></msub><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>68</mn><mo>.</mo><mn>32</mn><mo>&#160;</mo><mi>k</mi><mi>c</mi><mi>a</mi><mi>l</mi></math>. Heat of vaporisation of water at 1 atm and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>25</mn><mo>&#176;</mo></msup><mi mathvariant=\"normal\">C</mi></math>&nbsp;is 10.52 kcal. The standard heat of formation (in kcal) of 1 mole of water vapour at&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>25</mn><mo>&#176;</mo></msup></math>C is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:36:04', NULL),
(251046, '85,80,201,239', '<p>If water is formed from&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>H</mi><mo>+</mo></msup></math>ions and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>O</mi><msup><mi>H</mi><mo>-</mo></msup></math>, the heat of formation of water is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:36:55', NULL),
(251047, '85,80,201,239', '<p>Which compound will absorb the maximum amount of heat when dissolved in the same amount of water? (Integral heats of solution at&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>25</mn><mo>&#176;</mo></msup></math>C in kcal/mol of each solute are given in brackets):</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:39:12', NULL),
(251048, '85,80,201,239', '<p>In which case of mixing of a strong acid and a base each of 1N cocentration, temperature increase is highest?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:41:31', NULL),
(251049, '85,80,201,239', '<p>2.1 g of Fe combines with S evolving 3.77 kJ. The heat of formation of FeS in kJ/mol is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:42:26', NULL),
(251050, '85,80,201,239', '<p>The heat of neutralisation of HCl by NaOH is -55.9 kJ/mol. If the heat of neutralisation of HCN by NaOH is -12.1 kJ/mol. The energy of dissociation of HCN is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:49:15', NULL),
(251051, '85,80,201,239', '<p>When a certain amount of ethylene was burnt 6226 kJ heat was evolved. If heat of combustion of ehtylene is 1411 kJ, the volume of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>O</mi><mn>2</mn></msub></math>(at NTP) that entered into the reaction is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 09:51:50', NULL),
(251052, '85,80,201,239', '<p>The heat evolved during the combustion of 112 litre of water gas (mixture of equal vollume of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>C</mi><mi>O</mi></math>) is:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#8710;</mo><mi>H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>241</mn><mo>.</mo><mn>8</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi><mspace linebreak=\"newline\"/><mi>C</mi><mi>O</mi><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><mo>&#8710;</mo><mi>H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>283</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:06:16', NULL),
(251053, '85,80,201,239', '<p>Given, that&nbsp;</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mi mathvariant=\"normal\">A</mi><mo>(</mo><mi mathvariant=\"normal\">s</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mo>&#160;</mo><mi mathvariant=\"normal\">A</mi><mo>(</mo><mi mathvariant=\"normal\">l</mi><mo>)</mo><mo>;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mi mathvariant=\"normal\">x</mi><mspace linebreak=\"newline\"/><mi mathvariant=\"normal\">A</mi><mo>(</mo><mi mathvariant=\"normal\">I</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mi mathvariant=\"normal\">A</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mi mathvariant=\"normal\">y</mi></math></p>\r\n\r\n<p>The heat of sublimation of A will be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:07:26', NULL),
(251054, '85,80,201,239', '<p>The standard heat of formation of sodium ions in aqueous solution from the following data will be:</p>\r\n\r\n<p>Heat of solution NaOH(aq.) from NaOH(s) = -470.7 kJ</p>\r\n\r\n<p>Heat of formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>O</mi><msup><mi>H</mi><mo>-</mo></msup></math>(aq.) from&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>O</mi><msup><mi>H</mi><mo>-</mo></msup><mo>(</mo><mi>s</mi><mo>)</mo></math>&nbsp;= -228.8 kJ</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:09:05', NULL),
(251055, '85,80,201,239', '<p>If combustion of 4g of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub></math>&nbsp;liberates 2.5 kcal of heat, the heat of combustion of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:10:23', NULL),
(251056, '85,80,201,239', '<p>The heat of combustion of ehtanol determined by a bonb calorimeter is -670.48 kcal&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>&#160;</mo><mi>a</mi><mi>t</mi><mo>&#160;</mo><msup><mn>25</mn><mo>&#8728;</mo></msup><mi>C</mi></math>. What is&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">U</mi></math>&nbsp;at&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>25</mn><mo>&#176;</mo></msup><mi mathvariant=\"normal\">C</mi></math>&nbsp;for the following reaction?</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>C</mi><mn>2</mn></msub><msub><mi>H</mi><mn>5</mn></msub><mi>O</mi><mi>H</mi><mo>(</mo><mi>l</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mfrac><mn>7</mn><mn>2</mn></mfrac><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>3</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>g</mi><mo>)</mo></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:12:54', NULL),
(251057, '85,80,201,239', '<p>A person requires 2870 kcal of energy to lead normal daily life. If heat of combustion of cane sugar is -1349 kcal. then his daily consumption of sugar is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:13:43', NULL),
(251058, '85,80,201,239', '<p>The heat change taking place during the reaction&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>l</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mi>i</mi><mi>s</mi><mo>:</mo><mo>&#160;</mo><mo>[</mo><mi>G</mi><mi>i</mi><mi>v</mi><mi>e</mi><mi>n</mi><mo>,</mo><mo>&#160;</mo><mo>&#8710;</mo><msub><mi>H</mi><mi>f</mi></msub><mo>&#160;</mo><mi>o</mi><mi>f</mi><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>57</mn><mo>&#160;</mo><mi>k</mi><mi>c</mi><mi>a</mi><mi>l</mi><mo>,</mo><mo>&#160;</mo><mo>&#8710;</mo><mo>&#160;</mo><msub><mi>H</mi><mi>f</mi></msub><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>l</mi><mo>)</mo></math>&nbsp;= -68.3 kcal]</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:15:29', NULL),
(251059, '85,80,201,239', '<p>If&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>H</mi><mo>+</mo></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>O</mi><msup><mi>H</mi><mo>-</mo></msup><mo>&#160;</mo><mo>&#8594;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>13</mn><mo>.</mo><mn>7</mn></math>kcal then the heat of neutralisation for complete neutralisation of one mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;by a base will be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:16:46', NULL),
(251060, '85,80,201,239', '<p>The enthalpy of formation of ammonia gas at 298 K is -46.11 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. The equation to which this value relates is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:18:44', NULL),
(251061, '85,80,201,239', '<p>The heat of formation of methane&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mo>(</mo><mi>s</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>&nbsp;at constant pressure is 18500 cal at&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>25</mn><mo>&#176;</mo></msup></math>C. The heat of reaction at constant volume would be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:20:11', NULL),
(251062, '85,80,201,239', '<p>According to the equation:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>C</mi><mn>6</mn></msub><msub><mi>H</mi><mn>6</mn></msub><mo>(</mo><mi>l</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mfrac><mn>15</mn><mn>2</mn></mfrac><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mn>3</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>l</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>6</mn><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math></p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo></math>-3264.4 kJ/mol, the energy evolved when 7.8g of bezene is burnt in air will be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:22:04', NULL),
(251063, '85,80,201,239', '<p><math class=\"wrs_chemistry\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mo>&#8710;</mo><mi mathvariant=\"normal\">f</mi></msub><msup><mi>U</mi><mi>&#920;</mi></msup></math>&nbsp;of formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>&nbsp;at certain temperature is -393 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. The values of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mo>&#8710;</mo><mi mathvariant=\"normal\">f</mi></msub><msup><mi mathvariant=\"normal\">H</mi><mi>&#920;</mi></msup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:24:29', NULL),
(251064, '85,80,201,239', '<p>Enthalpy of sublimation of a substance is equal to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:25:21', NULL),
(251065, '85,80,201,239', '<p>If a chemical change is brought about by one or more methods in one or more steps, then the amount of heat absorbed or evolved during the complete couarse of reaction is same, whichever method was followed. This law is known as:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:28:18', NULL),
(251066, '85,80,201,239', '<p>The law of Lavoisier and Laplace is based on:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:29:59', NULL),
(251067, '85,80,201,239', '<p>Hess&#39;s law of constant heat summation is an application of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:31:01', NULL),
(251068, '85,80,201,239', '<p>The standard heat of formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>N</mi><mn>2</mn></msub><msub><mi>O</mi><mn>4</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>&nbsp;are 8.0 and 2.0 kcal&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;respectively. The heat dimerization of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;in kcal is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:32:16', NULL),
(251069, '85,80,201,239', '<p>Given enthalpy of formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>C</mi><mi>a</mi><mi>O</mi><mo>(</mo><mi>s</mi><mo>)</mo></math>&nbsp;are -94.0 kJ and -152 kJ respectively and the enthalpy of the reaction,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>a</mi><mi>C</mi><msub><mi>O</mi><mn>3</mn></msub><mo>(</mo><mi>s</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mi>C</mi><mi>a</mi><mi>O</mi><mo>(</mo><mi>s</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo></math>&nbsp;is 42 kJ. The enthalpy of formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>a</mi><mi>C</mi><msub><mi>O</mi><mn>3</mn></msub><mo>(</mo><mi>s</mi><mo>)</mo></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:34:22', NULL),
(251070, '85,80,201,239', '<p>The heat of combustion of rhombic and monoclinic sulphur are 70.96 and 71.03 kcal. The heat of tranistion of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>S</mi><mrow><mi>R</mi><mo>&#8594;</mo><mi>M</mi></mrow></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:35:34', NULL),
(251071, '85,80,201,239', '<p>The heat of combustion for C,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub></math>&nbsp;are -349.0, -241.8 and -906.7 kJ respectively. The heat of formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:37:13', NULL),
(251072, '85,80,201,239', '<p>Standard heat of formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>,</mo><mo>&#160;</mo><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>&nbsp;and water at&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>25</mn><mo>&#176;</mo></msup></math>C are -17.9, -94.1 and -68.3 kcal&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;respectively. Calculate the heat change (in kcal) in the following reaction at&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>25</mn><mo>&#176;</mo></msup><mi mathvariant=\"normal\">C</mi></math></p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>CH</mi><mn>4</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><msub><mi>CO</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>(</mo><mi mathvariant=\"normal\">l</mi><mo>)</mo></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:40:29', NULL),
(251073, '85,80,201,239', '<p>Given that standard heat enthalpy of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>C</mi><mn>2</mn></msub><msub><mi>H</mi><mn>4</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>C</mi><mn>3</mn></msub><msub><mi>H</mi><mn>8</mn></msub></math>&nbsp;are -17.9, 12.5, -24.8 kcal/mol. The&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi></math>&nbsp;for&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>C</mi><mn>2</mn></msub><msub><mi>H</mi><mn>4</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><msub><mi>C</mi><mn>3</mn></msub><msub><mi>H</mi><mn>8</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:42:23', NULL),
(251074, '85,80,201,239', '<p>Heat of combustion&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi></math>&nbsp;for C(s),&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>&nbsp;and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>&nbsp;are -94, -68 and -213 kcal/mole then&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi></math>&nbsp;for&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mi mathvariant=\"normal\">C</mi><mo>(</mo><mi mathvariant=\"normal\">s</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mfenced><mi mathvariant=\"normal\">g</mi></mfenced><mo>&#160;</mo><mo>&#8594;</mo><mo>&#160;</mo><msub><mi>CH</mi><mn>4</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:44:08', NULL),
(251075, '85,80,201,239', '<p>Consider the reactions given below. On the basis of these reactions find out which of the algebraic relations given in options (a) to (d) is correct?</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>(</mo><mi mathvariant=\"normal\">i</mi><mo>)</mo><mo>&#160;</mo><mi mathvariant=\"normal\">C</mi><mo>(</mo><mi>graphite</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>4</mn><mo>&#160;</mo><mi mathvariant=\"normal\">H</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><msub><mi>CH</mi><mn>4</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><msub><mo>&#8710;</mo><mi mathvariant=\"normal\">r</mi></msub><mi mathvariant=\"normal\">H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mi mathvariant=\"normal\">x</mi><mo>&#160;</mo><mi>kJ</mi><mo>&#160;</mo><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mspace linebreak=\"newline\"/><mo>(</mo><mi mathvariant=\"normal\">i</mi><mo>)</mo><mo>&#160;</mo><mi mathvariant=\"normal\">C</mi><mo>(</mo><mi>graphite</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><mo>&#160;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><msub><mi>CH</mi><mn>4</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><msub><mo>&#8710;</mo><mi mathvariant=\"normal\">r</mi></msub><mi mathvariant=\"normal\">H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mi mathvariant=\"normal\">y</mi><mo>&#160;</mo><mi>kJ</mi><mo>&#160;</mo><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 10:46:02', NULL),
(251076, '85,80,201,239', '<p>The bond energy of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub></math>&nbsp;is 104.3 kcal&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. It means: (N = Av. no.)</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 11:01:54', NULL),
(251077, '85,80,201,239', '<p>The bond energies of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>F</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><mi>B</mi><msub><mi>r</mi><mn>2</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>I</mi><mn>2</mn></msub></math>&nbsp;are 155.4, 243.6, 193.2 and 151.2 kJ<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;respectively. The strongest bond is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 11:03:49', NULL),
(251078, '85,80,201,239', '<p>Which one of the following bonds has the highest average bond energy (Kcal/mol)?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 11:04:40', NULL),
(251079, '85,80,201,239', '<p>Energy required to dissociate 4g of gaseous hydrogen into free gaseous atoms is 208 kcal at&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>25</mn><mo>&#176;</mo></msup></math>C. The bond energy of H - H bond will be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 11:07:22', NULL),
(251080, '85,80,201,239', '<p>AB,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>A</mi><mn>2</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>B</mi><mn>2</mn></msub></math>&nbsp;are diatomic molecules. If the bond enthalies of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>A</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><mi>A</mi><mi>B</mi><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>B</mi><mn>2</mn></msub></math>&nbsp;are in the rato 1 :1 : 0.5 and the enthalpy of formation of AB from&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>A</mi><mn>2</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>B</mi><mn>2</mn></msub></math>&nbsp;is -100 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>, what is the bond enthalpy of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>A</mi><mn>2</mn></msub></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 11:10:55', NULL),
(251081, '85,80,201,239', '<p>The dissociation energy of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>C</mi><mn>2</mn></msub><msub><mi>H</mi><mn>6</mn></msub></math>&nbsp;are respectively 360 and 620 kcal/mol. The bond energy of C-C bond is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 11:12:01', NULL),
(251082, '85,80,201,239', '<p>Bond energies of (H-H), (O&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>=</mo></math>O) and (O - H) are 105, 120 and 220 kcal/mol respectively, then&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi></math>&nbsp;in the reaction,&nbsp;</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mn>2</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>(</mo><mi mathvariant=\"normal\">l</mi><mo>)</mo><mo>:</mo></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-14 11:15:38', NULL),
(251083, '85,80,201,239', '<p>If the enthalpy change for the reaction</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>CH</mi><mn>4</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>Cl</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><msub><mi>CH</mi><mn>3</mn></msub><mo>&#160;</mo><mi>Cl</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>HCl</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>,</mo><mspace linebreak=\"newline\"/><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>25</mn><mo>&#160;</mo><mi>kcal</mi><mo>.</mo><mo>&#160;</mo></math></p>\r\n\r\n<p>Bond energy of C-H is 20 kcal&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;greater than the bond energy of C-Cl and bonjd energies of H-H and H-Cl are same in magnitude, then for the reaction:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfrac><mn>1</mn><mn>2</mn></mfrac><msub><mi>H</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mi>H</mi><mi>C</mi><mi>l</mi><mo>(</mo><mi>g</mi><mo>)</mo><mo>;</mo><mo>&#160;</mo><mo>&#8710;</mo><mi>H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>?</mo></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 11:59:42', NULL),
(251084, '85,80,201,239', '<p>Given the bond energies of N&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8801;</mo></math>N, H-H and N-H bonds as 945, 436 and 391 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;respectively, the enthalpy of the reaction,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>N</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>3</mn><msub><mi>H</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:01:13', NULL),
(251085, '85,80,201,239', '<p>Heat evolved in the reaction,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub><mo>&#160;</mo><mo>&#8594;</mo></math>2HCl is 182 kJ. Bond energies of H-H and Cl-Cl are 430 and 242 kJ/mol respectively. The H-Cl bond energy is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:03:10', NULL),
(251086, '85,80,201,239', '<p>From the reaction,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi mathvariant=\"normal\">P</mi><mfenced><mi>white</mi></mfenced></msub><mo>&#160;</mo><mo>&#8594;</mo><msub><mi mathvariant=\"normal\">P</mi><mfenced><mi>red</mi></mfenced></msub><mo>;</mo><mo>&#160;</mo><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>18</mn><mo>.</mo><mn>4</mn></math>&nbsp;kJ it follows that:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:04:47', NULL),
(251087, '85,80,201,239', '<p>For the reaction&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>3</mn><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><msub><mi>O</mi><mn>3</mn></msub><mo>;</mo><mo>&#160;</mo><mo>&#8710;</mo><mi>H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>+</mo><mi>v</mi><mi>e</mi></math>, we can say:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:06:30', NULL),
(251088, '85,80,201,239', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo></math>H for transition of carbon in the diamond form to carbon in the graphite form, is -453.5 cal. This suggests that:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:07:50', NULL),
(251089, '85,80,201,239', '<p>A mixture of hydrogen and chlorine on exposure to ultra violet sunlight reacts with explosion. The step involved in the initiation of the reaction is</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:10:34', NULL),
(251090, '85,80,201,239', '<p>The enthalpy changes of formation of the gaseous oxides of nitrogen&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mrow><msub><mi>N</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>N</mi><mi>O</mi></mrow></mfenced></math>&nbsp;are positive because of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:12:18', NULL),
(251091, '85,80,201,239', '<p>The enthalpy of formation of HI is 30.4 kJ. Which statement is false according to this observation?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:13:51', NULL),
(251092, '85,80,201,239', '<p>In a flask colourless&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>N</mi><mn>2</mn></msub><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;is in equilibrium with brown coloured&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>O</mi><mn>2</mn></msub><mo>.</mo><mo>&#160;</mo></math>&nbsp;At equilibrium when the flask is heated at&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>100</mn><mo>&#176;</mo></msup></math>C, the brown colour deepens and on cooling it becomes less coloured. The change in enthalpy,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi></math>&nbsp;for this system is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:16:19', NULL),
(251093, '85,80,201,239', '<p>The value of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><msup><mi mathvariant=\"normal\">H</mi><mo>&#176;</mo></msup></math>&nbsp;for the reaction&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mi>Cu</mi><mo>+</mo></msup><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msup><mi mathvariant=\"normal\">I</mi><mo>-</mo></msup><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mi>CuI</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo></math>&nbsp;is -446 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. If the ionisation energy of Cu(g) is 745kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;and the electron affinity of I(g) is -295 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>, then the value of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><msup><mi mathvariant=\"normal\">H</mi><mo>&#176;</mo></msup></math>&nbsp;for the formation of one mole of CuI(g) from Cu(g) and I(g) is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:21:30', NULL),
(251094, '85,80,201,239', '<p>The enthalpy change involved in the oxidation of glucose is -2880 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. Twenty five percent of this energy is available for muscular work. If 100 kJ of muscular work is needed to walk one kilometer, what is the maximum distance that a person will be able to walk after eating 120g of glucose?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:23:33', NULL),
(251095, '85,80,201,239', '<p>For the change,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>C</mi><mrow><mi>d</mi><mi>i</mi><mi>a</mi><mi>m</mi><mi>o</mi><mi>n</mi><mi>d</mi></mrow></msub><mo>&#160;</mo><mo>&#8594;</mo><msub><mi>C</mi><mrow><mi>g</mi><mi>r</mi><mi>a</mi><mi>p</mi><mi>h</mi><mi>i</mi><mi>t</mi><mi>e</mi></mrow></msub><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><mo>&#8710;</mo><mi>H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>1</mn><mo>.</mo><mn>89</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi></math>. If 6g of diamond and 6g of graphite are separately burnt to yield&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;the heat liberated in first case is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:25:33', NULL),
(251096, '85,80,201,239', '<p>For a diatomic molecule AB, the electronegativity difference between A and B = 0.2028<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msqrt><mo>&#8710;</mo></msqrt><mo>&#160;</mo><mo>[</mo><mo>&#160;</mo><mi>w</mi><mi>h</mi><mi>e</mi><mi>r</mi><mi>e</mi><mo>&#160;</mo><mo>&#8710;</mo></math>&nbsp;= Bond energy of AB - Geometric meean of the bond energies of&nbsp;&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>A</mi><mn>2</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>B</mi><mn>2</mn></msub><mo>]</mo></math>. The electronegativities of fluorine and chlorine are 4.0 and 3.0 respectively and the bond energies are of F-F : 38 kcal&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;and Cl-Cl: 58 kcal&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. The bond energy of Cl-F is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:29:18', NULL),
(251097, '85,80,201,239', '<p>The ionisation energy of solid NaCl is 180 kcal per mol. The dissolution of the solid in water in the form of ions is endothermic to the extent of 1 kcal per mol. If the solvation energies of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msup><mi>a</mi><mo>+</mo></msup><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>C</mi><msup><mi>l</mi><mo>-</mo></msup></math>&nbsp;ions are in the ratio 6 : 5, what is the enthalpy of hydrogen of sodium ion?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:33:00', NULL),
(251098, '85,80,201,239', '<p>Under the same conditions how many mL of 1M KOH and 0.5 M&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;solutions, respectively when mixed for a total volume of 100 mL produce the highest rise in temperature?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:36:27', NULL),
(251099, '85,80,201,239', '<p>For which change&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi><mo>&#160;</mo><mo>&#8800;</mo><mo>&#8710;</mo><mi mathvariant=\"normal\">U</mi></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:38:37', NULL),
(251100, '85,80,201,239', '<p>Molar heat capacity of water in equilibrium with the ice at constant pressure is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:40:08', NULL),
(251101, '85,80,201,239', '<p>Standard molar enthalpy of formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is equal to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:41:28', NULL),
(251102, '85,80,201,239', '<p>The&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><msubsup><mi mathvariant=\"normal\">H</mi><mi mathvariant=\"normal\">f</mi><mo>&#176;</mo></msubsup><mo>&#160;</mo><mi>for</mi><mo>&#160;</mo><msub><mi>CO</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>,</mo><mo>&#160;</mo><mi>CO</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mi>and</mi><mo>&#160;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo></math>are -393.5, -110.5 and -241.8 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;respectively. The standard enthalpy change (in kJ) for the reaction.</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mi>C</mi><mi>O</mi><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mi>i</mi><mi>s</mi><mo>:</mo></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:44:20', NULL),
(251103, '85,80,201,239', '<p>For the reactions :&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><mo>&#8710;</mo><mi>H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>393</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi><mo>&#160;</mo></math></p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>2</mn><mi>Z</mi><mi>n</mi><mo>+</mo><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><mi>Z</mi><mi>n</mi><mi>O</mi><mo>;</mo><mo>&#160;</mo><mo>&#8710;</mo><mi>H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>412</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi></math></p>\r\n\r\n<p>which one is correct?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:46:28', NULL),
(251104, '85,80,201,239', '<p>The heat required to raise the temperature of a body by 1K is called</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:47:16', NULL),
(251105, '85,80,201,239', '<p>Which of the reactions defines&nbsp;<math class=\"wrs_chemistry\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo>&#8710;</mo><msubsup><mi mathvariant=\"normal\">H</mi><mi>f</mi><mo>&#176;</mo></msubsup></math>&nbsp;?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:49:40', NULL),
(251106, '85,80,201,239', '<p>The enthalpy change for a reaction does not depend upon:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:50:45', NULL),
(251107, '85,80,201,239', '<p>If at 298 K the bond energies of C-H, C-C, C&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>=</mo></math>C and H-H bonds are respectively 414, 347, 615 and 435 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>, the value of enthalpy change for the reaction</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">C</mi><mo>&#160;</mo><mo>=</mo><msub><mi>CH</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>3</mn></msub><mi mathvariant=\"normal\">C</mi><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><msub><mi>CH</mi><mn>3</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo></math>&nbsp;at 298 K will be:</p>\r\n\r\n<p>&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:54:20', NULL);
INSERT INTO `questions` (`id`, `category_id`, `question`, `question_type`, `answer_type`, `subjective_ans`, `marks`, `time`, `added_by`, `status`, `current_url`, `created_at`, `updated_at`) VALUES
(251108, '85,80,201,239', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>If</mi><mo>,</mo><mo>&#160;</mo><mi mathvariant=\"normal\">C</mi><mo>(</mo><mi mathvariant=\"normal\">s</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><msub><mi>CO</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>.</mo><mo>&#160;</mo><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>393</mn><mo>.</mo><mn>5</mn><mo>&#160;</mo><mi>kJ</mi><mo>&#160;</mo><mi>and</mi><mspace linebreak=\"newline\"/><mi>C</mi><mi>O</mi><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>,</mo><mo>&#160;</mo><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>283</mn><mo>.</mo><mn>5</mn><mo>&#160;</mo><mi>kJ</mi><mo>&#160;</mo><mi>t</mi><mi>h</mi><mi>e</mi><mi>n</mi></math></p>\r\n\r\n<p>the heat of formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msup><mi>O</mi><mo>-</mo></msup></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:56:57', NULL),
(251109, '85,80,201,239', '<p>The enthalpy of vaporisation of a liquid is 30 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;and entropy of vaporisation is 75 J&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. The boiling point of liquid at 1 atm is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:58:13', NULL),
(251110, '85,80,201,239', '<p>For the reaction,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>N</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>3</mn><msub><mi>H</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>, which is true?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 12:59:53', NULL),
(251111, '85,80,201,239', '<p>Bond dissociation energy of XY,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>X</mi><mn>2</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>Y</mi><mn>2</mn></msub></math>&nbsp;(all diatomic molecules) are in the ratio 1 : 1 : 0.5 and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><msub><mi mathvariant=\"normal\">H</mi><mi mathvariant=\"normal\">f</mi></msub></math>&nbsp;of XY is -200 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. The bond dissociation energy of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>X</mi><mn>2</mn></msub></math>&nbsp;will be</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 13:02:18', NULL),
(251112, '85,80,201,239', '<p>The standard enthalpy of formation&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mfenced><mrow><msub><mo>&#8710;</mo><mi mathvariant=\"normal\">f</mi></msub><msup><mi mathvariant=\"normal\">H</mi><mo>&#176;</mo></msup></mrow></mfenced></math>&nbsp;at 298 K for methane,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>&nbsp;is -74.8 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. The additional information required to determine the average energy for C-H bond formation would be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 13:05:27', NULL),
(251113, '85,80,201,239', '<p>The enthalpy changes for the following processes are listed below,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>Cl</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>2</mn><mi>Cl</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><mn>242</mn><mo>.</mo><mn>3</mn><mo>&#160;</mo><mi>kJ</mi><mo>&#160;</mo><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mspace linebreak=\"newline\"/><msub><mi mathvariant=\"normal\">I</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>2</mn><mi mathvariant=\"normal\">I</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><mn>151</mn><mo>.</mo><mn>0</mn><mo>&#160;</mo><mi>kJ</mi><mo>&#160;</mo><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mspace linebreak=\"newline\"/><mi>ICI</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mi mathvariant=\"normal\">I</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>Cl</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><mn>211</mn><mo>.</mo><mn>3</mn><mo>&#160;</mo><mi>kJ</mi><mo>&#160;</mo><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mspace linebreak=\"newline\"/><msub><mi mathvariant=\"normal\">I</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">s</mi><mo>)</mo><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">I</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><mn>62</mn><mo>.</mo><mn>76</mn><mo>&#160;</mo><mi>kJ</mi><mo>&#160;</mo><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math></p>\r\n\r\n<p>Given that, the standard states for iodine and chlorine are&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>I</mi><mn>2</mn></msub><mo>(</mo><mi>s</mi><mo>)</mo><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>, the standard enthalpy of formation for ICI(g) is</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 13:09:45', NULL),
(251114, '85,80,201,239', '<p>The heat of combustion of methane is -880 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. If 3.2g of methane is burnt:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 13:10:50', NULL),
(251115, '85,80,201,239', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mrow><mo>&#8710;</mo><mi>H</mi><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mo>&#8710;</mo><mi>U</mi></mrow></mfenced></math>&nbsp;for the formation of carbon monoxide (CO) from its elements at 298 K is:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mrow><mi>R</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>8</mn><mo>.</mo><mn>314</mn><mo>&#160;</mo><mi>J</mi><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>&#160;</mo><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></mrow></mfenced></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-15 13:12:39', NULL),
(251116, '85,80,201,239', '<p>Assuming that water vapours are ideal gas. The change in internal energy&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mrow><mo>&#8710;</mo><mi>U</mi></mrow></mfenced></math>&nbsp;when&nbsp; 1 mol of water is vaporised at 1 bar pressure and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>100</mn><mo>&#176;</mo></msup></math>C. (Given molar enthalpy of vaporisation&nbsp; at 1 bar and 373 K is 41 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;R = 8.3 J&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>) will be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 11:28:35', NULL),
(251117, '85,80,201,239', '<p>In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>3</mn></msub><mi>O</mi><mi>H</mi><mo>(</mo><mi>l</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>3</mn><mo>/</mo><mn>2</mn><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>l</mi><mo>)</mo></math></p>\r\n\r\n<p>At 298 K standard Gibb&#39;s energies of formation for&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>3</mn></msub><mi>O</mi><mi>H</mi><mo>(</mo><mi>l</mi><mo>)</mo><mo>,</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>l</mi><mo>)</mo><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>&nbsp;are -166.2, -237.2 and -394.4 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;respectively. If standard enthalpy of combustion of methanol is&nbsp; -726 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>, efficiency of the fuel cell will be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 11:31:50', NULL),
(251118, '85,80,201,239', '<p>The species which by definition has zero standard molar enthalpy of formation at 298 K is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 11:33:09', NULL),
(251119, '85,80,201,239', '<p>The bond energy (in kcal&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>) of a C-C single bond is approximately.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 11:33:47', NULL),
(251120, '85,80,201,239', '<p>The standard enthalpy of formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub></math>&nbsp;is -46.0 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. If the enthalpy of formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub></math>&nbsp;from its atoms is -436 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;and that of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>N</mi><mn>2</mn></msub></math>&nbsp;is -712 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>, the average bond enthalpy of N-H bond in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 11:36:20', NULL),
(251121, '85,80,201,239', '<p>Consider the reaction,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>4</mn><mi>N</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><msub><mi>N</mi><mn>2</mn></msub><msub><mi>O</mi><mn>5</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>,</mo><mo>&#160;</mo><msub><mo>&#8710;</mo><mi>r</mi></msub><mo>&#160;</mo><mi>H</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>111</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi><mo>&#160;</mo><mi>I</mi><mi>f</mi><mo>&#160;</mo><msub><mi>N</mi><mn>2</mn></msub><msub><mi>O</mi><mn>5</mn></msub><mo>(</mo><mi>s</mi><mo>)</mo></math>&nbsp;is formed instead of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>N</mi><mn>2</mn></msub><msub><mi>O</mi><mn>5</mn></msub></math>(g) in the above reaction, the&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mo>&#8710;</mo><mi mathvariant=\"normal\">r</mi></msub><mi mathvariant=\"normal\">H</mi></math>&nbsp;value will be:</p>\r\n\r\n<p>(Given,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi></math>&nbsp;of sublimation for&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>N</mi><mn>2</mn></msub><msub><mi>O</mi><mn>5</mn></msub></math>&nbsp;is 54 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>)</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 11:39:30', NULL),
(251122, '85,80,201,239', '<p>The standard enthalpies of formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>,</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>l</mi><mo>)</mo></math>&nbsp;and glucose(s) at&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>25</mn><mo>&#176;</mo></msup></math>C are -400 kJ/mol, -300 kJ/mol and -1300 kJ/mol, respectively. The standard enthalpy of combustion per gram of glucose at&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>25</mn><mo>&#176;</mo></msup></math>C is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 11:41:33', NULL),
(251123, '85,80,201,239', '<p>For complete combustion of ethanol,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>C</mi><mn>2</mn></msub><msub><mi>H</mi><mn>5</mn></msub><mi>O</mi><mi>H</mi><mo>(</mo><mi>l</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>3</mn><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>3</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>l</mi><mo>)</mo></math>, the amount of heat produced as measured in bomb calorimeter, is 1364.47 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>&#160;</mo><mi>a</mi><mi>t</mi><mo>&#160;</mo><msup><mn>25</mn><mo>&#8728;</mo></msup><mi>C</mi></math>. Assuming ideality the Enthalpy of combustion,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mo>&#8710;</mo><mi>C</mi></msub><mi>H</mi></math>, for the reaction will be:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mrow><mi>R</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>8</mn><mo>.</mo><mn>314</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi><mo>&#160;</mo><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></mrow></mfenced></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 11:44:50', NULL),
(251124, '85,80,201,239', '<p>The following reaction is performed at 298 K</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>2</mn><mi>N</mi><mi>O</mi><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><mi>N</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math></p>\r\n\r\n<p>The standard free energy of formation of NO(g) is 86.6 kJ/mol at 298 K. What is the standard free energy of formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mi>a</mi><mi>t</mi><mo>&#160;</mo></math>298 K?&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mrow><msub><mi>K</mi><mi>p</mi></msub><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>1</mn><mo>.</mo><mn>6</mn><mo>&#160;</mo><mo>&#215;</mo><msup><mn>10</mn><mn>12</mn></msup></mrow></mfenced></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 11:49:56', NULL),
(251125, '85,80,201,239', '<p>The heats of combustion of carbon and carbon monoxide are -393.5 and -283.5 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>, respectively. The heat of formation (in kJ) of carbon monoxide per mole is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 11:51:29', NULL),
(251126, '85,80,201,239', '<p>The combustion of benzene (l) gives&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>&nbsp;and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>l</mi><mo>)</mo></math>. Given that heat of combustion of benzene at constant volume is -3263.9 kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>&#160;</mo><mi>at</mi><mo>&#160;</mo><msup><mn>25</mn><mo>&#176;</mo></msup><mi mathvariant=\"normal\">C</mi></math>; heat of combustion&nbsp; (in kJ&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>) of benzene at constant pressure will be:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mrow><mi>R</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>8</mn><mo>.</mo><mn>314</mn><mo>&#160;</mo><mi>J</mi><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></mrow></mfenced></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 11:53:58', NULL),
(251127, '85,80,201,239', '<p>Enthalpy of sublimation of iodine is 24 cal&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>g</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;at&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>200</mn><mo>&#176;</mo></msup></math>C. If specific heat of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>I</mi><mrow><mn>2</mn><mfenced><mi>s</mi></mfenced></mrow></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>I</mi><mrow><mn>2</mn><mfenced><mi>v</mi></mfenced></mrow></msub></math>&nbsp;are 0.055 and 0.031 cal&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>g</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>&#160;</mo><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;respectively, then enthalpy of sublimation of&nbsp;&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>I</mi><mrow><mn>2</mn><mfenced><mi>s</mi></mfenced></mrow></msub></math>&nbsp;at&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>250</mn><mo>&#176;</mo></msup><mi mathvariant=\"normal\">C</mi><mo>&#160;</mo><mi>in</mi><mo>&#160;</mo><mi>cal</mi><mo>&#160;</mo><msup><mi mathvariant=\"normal\">g</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 11:56:21', NULL),
(251128, '85,80,201,239', '<p>For silver,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>C</mi><mi>p</mi></msub><mo>&#160;</mo><mfenced><mrow><mi>J</mi><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></mrow></mfenced></math>&nbsp;= 23 + 0.01 T. If temperature of 3 mole of silver is raised from 300 to 1000 K at 1 atm pressure, the value of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi></math>&nbsp;will be closer to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 11:57:38', NULL),
(251129, '85,80,201,239', '<p>For&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi><msub><mi>r</mi><mn>2</mn></msub><mfenced><mi>l</mi></mfenced></math></p>\r\n\r\n<p>Enthalpy of atomisation = x kJ/mol</p>\r\n\r\n<p>Bond dissociation enthalpy of bromine = y kJ/mol, then</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 11:58:46', NULL),
(251130, '85,80,201,239', '<p>Given an element having following ionisation enthalpies&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>I</mi><msub><mi>E</mi><mn>1</mn></msub><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>496</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi><mo>&#160;</mo><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>I</mi><msub><mi>E</mi><mn>2</mn></msub><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>4562</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi><mo>&#160;</mo><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. One mole hydroxide of this element is treated separately with HCI and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;respectively. Moles of HCI and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;reacted respectively is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:01:41', NULL),
(251131, '85,80,201,239', '<p>The difference between&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>&#8710;</mo><mi mathvariant=\"normal\">H</mi><mo>&#160;</mo><mi>and</mi><mo>&#160;</mo><mo>&#8710;</mo><mi mathvariant=\"normal\">U</mi></math>&nbsp;when the combustion of heptane liquid is carried out at a temperature T is equal to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:02:38', NULL),
(251132, '85,80,201,239', '<p>Calculate&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mo>&#8710;</mo><mi mathvariant=\"normal\">f</mi></msub><msup><mi mathvariant=\"normal\">H</mi><mo>&#176;</mo></msup><mo>&#160;</mo><mo>(</mo><mi>in</mi><mo>&#160;</mo><mi>kJ</mi><mo>/</mo><mi>mol</mi><mo>)</mo></math>&nbsp;for&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>C</mi><mn>2</mn></msub><msub><mi>H</mi><mn>6</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>I</mi><mi>f</mi><mo>&#160;</mo><msub><mo>&#8710;</mo><mi>C</mi></msub><msup><mi>H</mi><mo>&#8728;</mo></msup><mfenced open=\"[\" close=\"]\"><msub><mi>C</mi><mfenced><mrow><mi>g</mi><mi>r</mi><mi>a</mi><mi>p</mi><mi>h</mi><mi>i</mi><mi>t</mi><mi>e</mi></mrow></mfenced></msub></mfenced><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>393</mn><mo>.</mo><mn>5</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi><mo>/</mo><mi>m</mi><mi>o</mi><mi>l</mi><mspace linebreak=\"newline\"/><msub><mo>&#8710;</mo><mi>C</mi></msub><msup><mi>H</mi><mo>&#8728;</mo></msup><mfenced open=\"[\" close=\"]\"><mrow><msub><mi>H</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></mrow></mfenced><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>286</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi><mo>/</mo><mi>m</mi><mi>o</mi><mi>l</mi><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mspace linebreak=\"newline\"/><msub><mo>&#8710;</mo><mi>C</mi></msub><msup><mi>H</mi><mo>&#8728;</mo></msup><mfenced open=\"[\" close=\"]\"><mrow><msub><mi>C</mi><mn>2</mn></msub><msub><mi>H</mi><mn>6</mn></msub><mfenced><mi>g</mi></mfenced></mrow></mfenced><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>1560</mn><mo>&#160;</mo><mi>k</mi><mi>J</mi><mo>/</mo><mi>m</mi><mi>o</mi><mi>l</mi></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:05:13', NULL),
(251133, '85,80,239,916', '<p>The best explanation for not placing hydrogen with the group of alkali metals or halogens is that the:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:14:09', NULL),
(251134, '85,80,239,916', '<p>Deuterium resembles hydrogen in chemical properties but reacts:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:17:01', NULL),
(251135, '85,80,239,916', '<p>Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is most important in this respect?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:19:17', NULL),
(251136, '85,80,239,916', '<p>Why does&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>H</mi><mo>+</mo></msup></math>&nbsp;ion always get associated with other atoms or molecules?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:21:27', NULL),
(251137, '85,80,239,916', '<p>Hydrogen is not obtained when zinc reacts with:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:22:33', NULL),
(251138, '85,80,239,916', '<p>Hydrogen absorbed on pallodium is known as:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:23:16', NULL),
(251139, '85,80,239,916', '<p>In solid hydrogen, the intermolecular bonding is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:23:49', NULL),
(251140, '85,80,239,916', '<p>On bubbling&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;through a solution of barium peroxide in water&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:25:15', NULL),
(251141, '85,80,239,916', '<p>The ortho and para hydrogen posses:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:26:28', NULL),
(251142, '85,80,239,916', '<p>Para hydrogen is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:27:05', NULL),
(251143, '85,80,239,916', '<p>In Bosch&#39;s process which gas is utilised for the production of hydrogen gas?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:27:45', NULL),
(251144, '85,80,239,916', '<p>Atomic hydrogen is obtained by:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:28:46', NULL),
(251145, '85,80,239,916', '<p>Hydrogen is not used:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:29:26', NULL),
(251146, '85,80,239,916', '<p>Pure&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub></math>&nbsp;is obtained by the action of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:31:29', NULL),
(251147, '85,80,239,916', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>T</mi><mi>i</mi><msub><mi>H</mi><mrow><mn>1</mn><mo>.</mo><mn>73</mn></mrow></msub></math>&nbsp;is an example of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:32:18', NULL),
(251148, '85,80,239,916', '<p>The acidified solution of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><mi>e</mi><mi>C</mi><msub><mi>l</mi><mn>3</mn></msub></math>&nbsp;is reduced by passing:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:33:30', NULL),
(251149, '85,80,239,916', '<p>Heavy hydrogen is used:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:35:11', NULL),
(251150, '85,80,239,916', '<p>In the preparation of hydrogenated oil the chemical reaction involving hydrogen is called:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:35:52', NULL),
(251151, '85,80,239,916', '<p>Ordinary hydrogen has preponderance of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:36:40', NULL),
(251152, '85,80,239,916', '<p>Ordinary hydrogen is a mixture of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:38:38', NULL),
(251153, '85,80,239,916', '<p>When different metals like Zn, Sn, Fe are added to dilute sulphuric acid, same gas, which burns explosively in air, is evolved, The gas is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:39:56', NULL),
(251154, '85,80,239,916', '<p>Hydrogen gas will not reduce:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:40:35', NULL),
(251155, '85,80,239,916', '<p>Hydrogen may be prepared by heating a solution of caustic soda with:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:41:07', NULL),
(251156, '85,80,239,916', '<p>Nascent hydrogen consists of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:41:58', NULL),
(251157, '85,80,239,916', '<p>Hydrogen burns with:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:42:27', NULL),
(251158, '85,80,239,916', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub></math>&nbsp;acts as an oxidant in its reaction with:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:43:15', NULL),
(251159, '85,80,239,916', '<p>The most dangerous method of preparing hydrogen would be by the action of dil. HCl and:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:44:31', NULL),
(251160, '85,80,239,916', '<p>The most reactive state of hydrogen is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:45:30', NULL),
(251161, '85,80,239,916', '<p>The life period of atomic hydrogen is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:46:09', NULL),
(251162, '85,80,239,916', '<p>The percentage of para-hydrogen in ordinary hydrogen increases when:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:47:02', NULL),
(251163, '85,80,239,916', '<p>At absolute zero:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:47:47', NULL),
(251164, '85,80,239,916', '<p>Hydrogen produced in contact with substance which is to be reduced is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:48:47', NULL),
(251165, '85,80,239,916', '<p>The catalyst used in Bosch process of manufacture of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:49:53', NULL),
(251166, '85,80,239,916', '<p>Atomic hydrogen produces formaldehyde when it reacts with&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:50:47', NULL),
(251167, '85,80,239,916', '<p>Under what condition of temperature and pressure the formation of atomic hydrogen from molecular hydrogen will be favoured most?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:51:57', NULL),
(251168, '85,80,239,916', '<p>Hydrogen is evolved the action of cold dilute&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>H</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;on:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:52:41', NULL),
(251169, '85,80,239,916', '<p>Metal which does not react with cold water but evolves&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub></math>&nbsp;with steam is</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:53:24', NULL),
(251170, '85,80,239,916', '<p>Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH, the correct order of increasing ionic character is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:55:14', NULL),
(251171, '85,80,239,916', '<p>Elements of which of the following groups(s) of periodic table do not form hydrides?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:56:11', NULL),
(251172, '85,80,239,916', '<p>Only one element of.....forms hydride.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:56:42', NULL),
(251173, '85,80,239,916', '<p>The rubber foam is produced by passing oxygen through rubber foaming material. This oxygen is released from:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:57:39', NULL),
(251174, '85,80,239,916', '<p>Which one is correct for perhydrol?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 12:59:00', NULL),
(251175, '85,80,239,916', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is stored in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:00:17', NULL),
(251176, '85,80,239,916', '<p>Acidified solution of chromic acid on treatment with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;yields:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:02:32', NULL),
(251177, '85,80,239,916', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;turns an acidified solution of.......to orange red.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:04:56', NULL),
(251178, '85,80,239,916', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is prepared in the laboratory when:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:07:52', NULL),
(251179, '85,80,239,916', '<p>In the hydrogen peroxide molecule:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:09:05', NULL),
(251180, '85,80,239,916', '<p>A mixture of hydrazine and 40 to 60 per cent of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;solution is</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:10:00', NULL),
(251181, '85,80,239,916', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;reduces&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>K</mi><mn>3</mn></msub><mi>F</mi><mi>e</mi><msub><mrow><mo>(</mo><mi>C</mi><mi>N</mi><mo>)</mo></mrow><mn>6</mn></msub></math>&nbsp;in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:11:19', NULL),
(251182, '85,80,239,916', '<p>The volume of &#39;40 vol.&#39; of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;required to liberate 500 mL&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;at NTP is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:12:26', NULL),
(251183, '85,80,239,916', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>K</mi><mi>a</mi></msub></math>&nbsp;for&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is of the order of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:13:48', NULL),
(251184, '85,80,239,916', '<p>Hydrogen peroxide does not:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:15:08', NULL),
(251185, '85,80,239,916', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;acts as antiseptic due to its:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:16:04', NULL),
(251186, '85,80,239,916', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;on treatment with chlorine gives:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:17:22', NULL),
(251187, '85,80,239,916', '<p>Ozone reacts with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;to give oxygen. One volume of ozone gives:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:18:23', NULL),
(251188, '85,80,239,916', '<p>Ammonium persulphate solution on heating under reduced pressure gives:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:19:37', NULL),
(251189, '85,80,239,916', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;restores the colour of old lead paintings, blackened by the action of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><mo>&#160;</mo><mi>g</mi><mi>a</mi><mi>s</mi><mo>,</mo><mo>&#160;</mo><mi>b</mi><mi>y</mi></math>:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:21:39', NULL),
(251190, '85,80,239,916', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;restores the colour of old lead paintings, blackened by the action of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><mo>&#160;</mo><mi>g</mi><mi>a</mi><mi>s</mi><mo>,</mo><mo>&#160;</mo><mi>b</mi><mi>y</mi></math>:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:21:39', NULL),
(251191, '85,80,239,916', '<p>Decomposition of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is accelerated by:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:22:30', NULL),
(251192, '85,80,239,916', '<p>Which of the following will not give&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;on hydrolysis?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:24:09', NULL),
(251193, '85,80,239,916', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:24:48', NULL),
(251194, '85,80,239,916', '<p>Smell of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;resembles:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:25:34', NULL),
(251195, '85,80,239,916', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;liberates oxygen from a solution of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>(the action being catalytic) only if the solution is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:27:24', NULL),
(251196, '85,80,239,916', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is concentrated by</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 13:28:21', NULL),
(251197, '85,80,239,916', '<p>Which is not true in case of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 15:29:00', NULL),
(251198, '85,80,239,916', '<p>Decomposition of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is accompanied by:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 15:30:54', NULL),
(251199, '85,80,239,916', '<p>Pure&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 15:33:33', NULL),
(251200, '85,80,239,916', '<p>A given solution of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is 30 volume. Its concentration in terms of molarity is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 15:35:28', NULL),
(251201, '85,80,239,916', '<p>The percentage by weight of hydrogen in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 15:36:16', NULL),
(251202, '85,80,239,916', '<p>The hair dyes available in the market generally contain two bottles, one containing the dye and the other hydrogen peroxide. Before applying the dye, the two solutions are mixed. the hydrogen peroxide</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 15:44:02', NULL),
(251203, '85,80,239,916', '<p>When sodium peroxide is treated with dilute sulphuric acid, we get.......</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 15:45:12', NULL),
(251204, '85,80,239,916', '<p>which is used to determine hardness of water volumetrically?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 15:46:24', NULL),
(251205, '85,80,239,916', '<p>Heavy water&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mrow><msub><mi>D</mi><mn>2</mn></msub><mi>O</mi></mrow></mfenced></math>&nbsp;has found application in atomic reactor as:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 15:47:25', NULL),
(251206, '85,80,239,916', '<p>Hard water becomes free from...ions when passed through ion exchange resin containing RCOOH groups.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 15:48:49', NULL),
(251207, '85,80,239,916', '<p>Heavy water is qualified as heavy because it is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 15:50:41', NULL),
(251208, '85,80,239,916', '<p>Both temporary and permanent hardness are removed on boiling water with:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 15:51:53', NULL),
(251209, '85,80,239,916', '<p>Hard water is not fit for washing clothes because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 15:53:02', NULL),
(251210, '85,80,239,916', '<p>Which one of the following statements about water is FALSE?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 15:54:17', NULL),
(251211, '85,80,239,916', '<p>Heavy water freezes at:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 15:56:38', NULL),
(251212, '85,80,239,916', '<p>The melting points of most of the solid substances increase with an increase of pressure. However, ice melts at a temperature lower than its usual melting point&nbsp; when the pressre is increased. This is because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:02:15', NULL),
(251213, '85,80,239,916', '<p>Permutit is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:03:14', NULL),
(251214, '85,80,239,916', '<p>Which does not react with cold water?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:06:39', NULL),
(251215, '85,80,239,916', '<p>Which method cannot be used to remove hardness of water?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:07:24', NULL);
INSERT INTO `questions` (`id`, `category_id`, `question`, `question_type`, `answer_type`, `subjective_ans`, `marks`, `time`, `added_by`, `status`, `current_url`, `created_at`, `updated_at`) VALUES
(251216, '85,80,239,916', '<p>Point out the incorrect statement.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:09:04', NULL),
(251217, '85,80,239,916', '<p>The best method of test whether a clear liquid is water, is to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:10:15', NULL),
(251218, '85,80,239,916', '<p>What is formed when calcium carbide reacts with heavy water?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:11:14', NULL),
(251219, '85,80,239,916', '<p>Maximum density of heavy water is at:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:12:15', NULL),
(251220, '85,80,239,916', '<p>Heavy water is not used for drinking because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:13:09', NULL),
(251221, '85,80,239,916', '<p>Calgon is an industrial name given to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:13:56', NULL),
(251222, '85,80,239,916', '<p>The exhausted permutit is generally regenerated by percolating through it a solution of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:14:47', NULL),
(251223, '85,80,239,916', '<p>Sodiuim zeolite is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:16:42', NULL),
(251224, '85,80,239,916', '<p>Permanent hardness of water can be removed by adding calgon&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mfenced><mrow><mi>N</mi><mi>a</mi><mi>P</mi><msub><mi>O</mi><mn>3</mn></msub></mrow></mfenced><mi>n</mi></msub></math>. This is an example of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:17:48', NULL),
(251225, '85,80,239,916', '<p>Water contracts on heating:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:19:07', NULL),
(251226, '85,80,239,916', '<p>The boiling point of heavy water is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:20:13', NULL),
(251227, '85,80,239,916', '<p>Which of the following is correct about heavy water?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:21:34', NULL),
(251228, '85,80,239,916', '<p>Which of the following compounds is used for water softening?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:22:53', NULL),
(251229, '85,80,239,916', '<p>An inorganic compound liberates&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;when heated, turns an acid solution of Kl brown and reduces acidified&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>. The substance is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:24:40', NULL),
(251230, '85,80,239,916', '<p>Which gas burns in air with pop up sound?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:25:34', NULL),
(251231, '85,80,239,916', '<p>Hydride gap is shown by the members of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:26:06', NULL),
(251232, '85,80,239,916', '<p>Plumbosolvency is a health hazard in the transportation of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:26:49', NULL),
(251233, '85,80,239,916', '<p>Saline hydrides react explosively with water, such fires can be extinguished by:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:27:32', NULL),
(251234, '85,80,239,916', '<p>Hydrogen will not reduce:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:28:12', NULL),
(251235, '85,80,239,916', '<p>Pick the odd one out:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:29:56', NULL),
(251236, '85,80,239,916', '<p>There is a sample of 3.035% of hydrogen peroxide solution. Calculate its volume strenght</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:30:40', NULL),
(251237, '85,80,239,916', '<p>20 volumes&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;solution has a strength of about:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:31:19', NULL),
(251238, '85,80,239,916', '<p>The volume of oxygen liberated from 0.68g of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:32:03', NULL),
(251239, '85,80,239,916', '<p>Hardness of water is due to presence of salts of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:33:27', NULL),
(251240, '85,80,239,916', '<p>Which of the following is correct for hydrogen?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:34:29', NULL),
(251241, '85,80,239,916', '<p>The hardness of water is due to.........metal ions.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:35:56', NULL),
(251242, '85,80,239,916', '<p>Which of the following statements about hydrogen is incorrect?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:38:00', NULL),
(251243, '85,80,239,916', '<p>The method used to remove temporary hardness of water is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:38:52', NULL),
(251244, '85,80,239,916', '<p>The ionization of hdyrogen atom gives:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:39:42', NULL),
(251245, '85,80,239,916', '<p>Moist hydrogen cannot be dried over concentrated&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:41:11', NULL),
(251246, '85,80,239,916', '<p>Hydrogen molecules are</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:42:47', NULL),
(251247, '85,80,239,916', '<p>At its melting point ice is lighter than water because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:44:31', NULL),
(251248, '85,80,239,916', '<p>The pair that yields the same gaseous product on reaction with water</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:45:50', NULL),
(251249, '85,80,239,916', '<p>The dielectric constant of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></math>&nbsp;is 80. The electrostatic force of attraction between&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msup><mi>a</mi><mo>+</mo></msup><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>C</mi><msup><mi>l</mi><mo>-</mo></msup></math>&nbsp;will be.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:47:24', NULL),
(251250, '85,80,239,916', '<p>The O-O-H bond angle in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:48:31', NULL),
(251251, '85,80,239,916', '<p>Which of the following groups of ions makes the water hard?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:49:22', NULL),
(251252, '85,80,239,916', '<p>The volume strengh of 1.5 N&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;solution is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:50:09', NULL),
(251253, '85,80,239,916', '<p>Which one of the following pairs of substances on reaction will not evolve&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub></math>&nbsp;gas ?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:51:32', NULL),
(251254, '85,80,239,916', '<p>When&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is oxidised, the product is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:52:40', NULL),
(251255, '85,80,239,916', '<p>Pure water can be obtained from sea water by:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:53:16', NULL),
(251256, '85,80,239,916', '<p>Which statement about zeolite is false?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:55:07', NULL),
(251257, '85,80,239,916', '<p>Some statements about heavy water are given below:</p>\r\n\r\n<p>(i) Heavy water is used as a moderator in nuclear reactors</p>\r\n\r\n<p>(ii) Heavy water is more associated than ordinary water</p>\r\n\r\n<p>(iii) Heavy water&nbsp; is more effective solvent than ordinary water</p>\r\n\r\n<p>Which of the above statements are correct?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:56:44', NULL),
(251258, '85,80,239,916', '<p>Role of hydrogen peroxide in the following reaction is respectively:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo>(</mo><mi>i</mi><mo>)</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>O</mi><mn>3</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><mi>O</mi><mspace linebreak=\"newline\"/><mo>(</mo><mi>i</mi><mi>i</mi><mo>)</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>A</mi><msub><mi>g</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><mi>A</mi><mi>g</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>O</mi><mn>2</mn></msub></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-16 16:58:48', NULL),
(251259, '85,80,239,916', '<p>The volume strength of 1.5&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;solution is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 06:31:34', NULL),
(251260, '85,80,239,916', '<p>The amount of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;present in 1 L of 1.5&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;solution is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 06:32:24', NULL),
(251261, '85,80,239,916', '<p>The species that does not contain peroxide is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 06:33:15', NULL),
(251262, '85,80,239,916', '<p>The maximum possible number of hydrogen bonds a water molecule can form is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 06:33:39', NULL),
(251263, '85,80,239,916', '<p>Blackended oil painting can be restored into original form by the action of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 06:34:37', NULL),
(251264, '85,80,239,916', '<p>The reagent commonly used to determine hardness of water titrimetrically is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 06:36:18', NULL),
(251265, '85,80,239,916', '<p>Which of the following pairs will not produce dihydrogen gas?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:00:17', NULL),
(251266, '85,80,239,916', '<p>Among&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>a</mi><msub><mi>H</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub><mo>,</mo><mo>&#160;</mo><mi>N</mi><mi>a</mi><mi>H</mi><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>B</mi><mn>2</mn></msub><msub><mi>H</mi><mn>6</mn></msub></math>, which are covalent hydrides?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:01:48', NULL),
(251267, '85,80,239,916', '<p>When hydrogen peroxide is added to acidified potassium dichromate, a blue color is produced due to the formation of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:03:06', NULL),
(251268, '85,80,239,916', '<p>Hydrolysis of one mole of peroxodisulphuric acid products:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:04:33', NULL),
(251269, '85,80,239,916', '<p>The critical temperature of water is higher than that of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;because&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></math>&nbsp;molecule has:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:13:06', NULL),
(251270, '85,80,239,916', '<p>When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:14:29', NULL),
(251271, '85,80,239,916', '<p>In context with industrial preparation of hydrogen from water gas (CO +&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub></math>), which of the following is the correct statement?&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:18:21', NULL),
(251272, '85,80,239,916', '<p>Hydrogen peroxide is now generally prepared on industrial scale by the:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:22:27', NULL),
(251273, '85,80,239,916', '<p>One mole of calcium phosphide on reaction with excess water gives:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:23:42', NULL),
(251274, '85,80,239,916', '<p>When silicon is boiled with caustic soda solution, the gas evolved is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:24:47', NULL),
(251275, '85,80,239,916', '<p>Under what condition of temperature and pressure the formation of atomic hydrogen from molecular hydrogen will be favored most?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:26:34', NULL),
(251276, '85,80,239,916', '<p>Polyphosphates are used as water softening agents because they:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:27:44', NULL),
(251277, '85,80,239,916', '<p>Hydrogen is evolved by the action of cold dilute&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>H</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;on:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:28:31', NULL),
(251278, '85,80,239,916', '<p>Metal which does not react cold water but evolves&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub></math>&nbsp;with steam is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:29:12', NULL),
(251279, '85,80,239,916', '<p>Which will produce hard water?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:32:39', NULL),
(251280, '85,80,239,916', '<p>Which of the following could act as&nbsp; propellant for rockets?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:38:29', NULL),
(251281, '85,80,239,916', '<p>Which of the following is correct about heavy water?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 07:40:08', NULL),
(251282, '85,80,239,916', '<p>When zeolities (hydrated sodium aluminium silicate) is treated with hard water, the sodium ions are exchanged with:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:07:21', NULL),
(251283, '85,80,239,916', '<p>Ortho and para hydrogen have</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:09:04', NULL),
(251284, '85,80,239,916', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mi>CO</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mo>&#160;</mo><munderover><mo>&#8594;</mo><mrow><mi mathvariant=\"normal\">X</mi><mo>(</mo><mi>catalyst</mi><mo>)</mo></mrow><mrow><msup><mn>300</mn><mo>&#176;</mo></msup><mi mathvariant=\"normal\">C</mi><mo>/</mo><mn>300</mn><mo>&#160;</mo><mi>atm</mi></mrow></munderover><msub><mi>CH</mi><mn>3</mn></msub><mi>OH</mi></math></p>\r\n\r\n<p>The catalyst &#39;X&#39; is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:10:45', NULL),
(251285, '85,80,239,916', '<p>Which of the following undergoes reduction with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;in an alkaline medium?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:11:45', NULL),
(251286, '85,80,239,916', '<p>In the reaction&nbsp;</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><mi>S</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:31:18', NULL),
(251287, '85,80,239,916', '<p>Very pure hydrogen (99.9%) can be made by whch of the following processes?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:33:19', NULL),
(251288, '85,80,239,916', '<p>In the reaction,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>2</mn><mi>F</mi><mi>e</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub><mo>+</mo><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub><mo>+</mo><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub><mo>&#8594;</mo><mi>F</mi><msub><mi>e</mi><mn>2</mn></msub><msub><mrow><mo>(</mo><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub><mo>)</mo></mrow><mn>3</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></math></p>\r\n\r\n<p>The oxidizing agent is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:37:25', NULL),
(251289, '85,80,239,916', '<p>From the following statements regarding&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>, choose the incorrect statement:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:38:37', NULL),
(251290, '85,80,239,916', '<p>Which one of the following statements about water is FALSE?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:40:10', NULL),
(251291, '85,80,239,916', '<p>Which of the following combination willl produce&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub></math>&nbsp;gas?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:41:33', NULL),
(251292, '85,80,239,916', '<p>The isotope of hydrogen are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:43:29', NULL),
(251293, '85,80,239,916', '<p>What is reason of temporary hardness of water?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:44:32', NULL),
(251294, '85,80,239,916', '<p>The chemical nature of hydrogen peroxide is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:45:58', NULL),
(251295, '85,80,239,916', '<p>The total number of isotope of hydrogen and number of radioactive isotopes among them, respectively are</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:48:13', NULL),
(251296, '85,80,239,916', '<p>Among the following reactions of hydrogen with halogens, the one that requires a catalyst is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:49:45', NULL),
(251297, '85,80,239,916', '<p>The hydrid that is not electron deficient is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:50:33', NULL),
(251298, '85,80,239,916', '<p>The correct statements among(a) to (d) are</p>\r\n\r\n<p>1. Saline hydrides produce&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub></math>&nbsp;gas when reacted with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></math></p>\r\n\r\n<p>2. Reaction of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>L</mi><mi>i</mi><mi>A</mi><mi>l</mi><msub><mi>H</mi><mn>4</mn></msub><mo>&#160;</mo><mi>w</mi><mi>i</mi><mi>t</mi><mi>h</mi><mo>&#160;</mo><mi>B</mi><msub><mi>F</mi><mn>3</mn></msub><mo>&#160;</mo><mi>l</mi><mi>e</mi><mi>a</mi><mi>d</mi><mi>s</mi><mo>&#160;</mo><mi>t</mi><mi>o</mi><mo>&#160;</mo><msub><mi>B</mi><mn>2</mn></msub><msub><mi>H</mi><mn>6</mn></msub></math></p>\r\n\r\n<p>3.&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>P</mi><msub><mi>H</mi><mrow><mn>3</mn><mo>&#160;</mo></mrow></msub><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub></math>&nbsp;are electron rich and electron precise hydrides, respectively</p>\r\n\r\n<p>4. HF and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub></math>&nbsp;are called as molecular hydrides</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:53:12', NULL),
(251299, '85,80,239,916', '<p>It zeolities and synthetic resin method which will be more efficient in removing permanent hardness of water</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-18 09:55:10', NULL),
(251300, '85,80,239,915', '<p>The oxidation state of +3 for phosphorus is in</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-19 01:52:38', NULL),
(251301, '85,80,239,915', '<p>The ox. no. of S in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>a</mi><mn>2</mn></msub><msub><mi>S</mi><mn>4</mn></msub><msub><mi>O</mi><mn>6</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-19 01:55:10', NULL),
(251302, '85,80,239,915', '<p>Which among the following shows maximum oxidation state?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-19 01:55:51', NULL),
(251303, '85,80,239,915', '<p>Which substance serves as a reducing agent in the following reaction,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mfenced open=\"[\" close=\"]\"><mrow><mn>4</mn><msup><mi mathvariant=\"normal\">H</mi><mo>+</mo></msup><mo>+</mo><msub><mi>Cr</mi><mn>2</mn></msub><msubsup><mi mathvariant=\"normal\">O</mi><mn>7</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>+</mo><mn>3</mn><mi>Ni</mi><mo>&#8594;</mo><mn>2</mn><msup><mi>Cr</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup><mo>+</mo><mn>7</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>3</mn><msup><mi>Ni</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></mrow></mfenced></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-19 01:59:25', NULL),
(251304, '85,80,239,915', '<p>The oxidation stae of I in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi mathvariant=\"normal\">H</mi><mn>4</mn></msub><msubsup><mi>IO</mi><mn>6</mn><mo>-</mo></msubsup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-19 02:00:54', NULL),
(251305, '85,80,239,915', '<p>The oxide, which cannot act as a reducing agent is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-19 02:02:01', NULL),
(251306, '85,80,239,915', '<p>Which of the following is redox reaction?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-19 02:03:42', NULL),
(251307, '85,80,239,915', '<p>Oxidation state of Fe in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><msub><mi>e</mi><mn>3</mn></msub><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-19 02:04:46', NULL),
(251308, '85,80,239,915', '<p>A, B and C are three elements forming a part of compound in oxidation states of +2, +5 and -2 respectively. What could be the compound?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-19 02:06:49', NULL),
(251309, '85,80,239,915', '<p>Which is best description of the behaviour of bromine in the reaction given below?</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi mathvariant=\"bold-italic\">H</mi><mn mathvariant=\"bold\">2</mn></msub><mi mathvariant=\"bold-italic\">O</mi><mo mathvariant=\"bold\">&#160;</mo><mo mathvariant=\"bold\">+</mo><mo mathvariant=\"bold\">&#160;</mo><mi mathvariant=\"bold-italic\">B</mi><msub><mi mathvariant=\"bold-italic\">r</mi><mn mathvariant=\"bold\">2</mn></msub><mo mathvariant=\"bold\">&#8594;</mo><mi mathvariant=\"bold-italic\">H</mi><mi mathvariant=\"bold-italic\">O</mi><mi mathvariant=\"bold-italic\">B</mi><mi mathvariant=\"bold-italic\">r</mi><mo mathvariant=\"bold\">&#160;</mo><mo mathvariant=\"bold\">+</mo><mo mathvariant=\"bold\">&#160;</mo><mi mathvariant=\"bold-italic\">H</mi><mi mathvariant=\"bold-italic\">B</mi><mi mathvariant=\"bold-italic\">r</mi></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-19 02:10:27', NULL),
(251310, '85,80,239,915', '<p>Oxidation numbers of P in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>PO</mi><mn>4</mn><mrow><mn>3</mn><mo>-</mo></mrow></msubsup><mo>&#160;</mo><mi>of</mi><mo>&#160;</mo><mi mathvariant=\"normal\">S</mi><mo>&#160;</mo><mi>in</mi><mo>&#160;</mo><msubsup><mi>SO</mi><mn>4</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup></math>&nbsp;and that of Cr in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>Cr</mi><mn>2</mn></msub><msubsup><mi mathvariant=\"normal\">O</mi><mn>7</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup></math>&nbsp;are respectively:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-19 02:13:52', NULL),
(251311, '85,80,239,915', '<p>Oxidation no. of P in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>4</mn></msub><msub><mi>P</mi><mn>2</mn></msub><msub><mi>O</mi><mn>5</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>H</mi><mn>4</mn></msub><msub><mi>P</mi><mn>2</mn></msub><msub><mi>O</mi><mn>6</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>H</mi><mn>4</mn></msub><msub><mi>P</mi><mn>2</mn></msub><msub><mi>O</mi><mn>7</mn></msub></math>&nbsp;are respectively:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doupdate', '2025-08-20 06:00:40', NULL),
(251312, '85,80,239,915', '<p>Which of the following oxidation state is the most common among the lanthanoides?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doupdate', '2025-08-20 06:01:37', NULL),
(251313, '85,80,239,915', '<p>In which of the following compounds, nitrogen exhibits highest oxidation state?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doupdate', '2025-08-20 06:02:42', NULL),
(251314, '85,80,239,915', '<p>When&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></math>&nbsp;gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine hanges from:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 06:06:43', NULL),
(251315, '85,80,239,915', '<p>A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 06:08:03', NULL),
(251316, '85,80,239,915', '<p>The pair of compounds that can exist together is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 06:12:46', NULL),
(251317, '85,80,239,915', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mfenced><mi mathvariant=\"normal\">i</mi></mfenced><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>O</mi><mn>3</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mspace linebreak=\"newline\"/><mo>(</mo><mi>ii</mi><mo>)</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mo>+</mo><msub><mi>Ag</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><mi>Ag</mi><mo>+</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub></math></p>\r\n\r\n<p>Role of hydrogen peroxide in the above reactions is respectively:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 06:15:26', NULL),
(251318, '85,80,239,915', '<p>In acidic medium,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;changes&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>Cr</mi><mn>2</mn></msub><msubsup><mi mathvariant=\"normal\">O</mi><mn>7</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>&#160;</mo><mi>to</mi><mo>&#160;</mo><msub><mi>CrO</mi><mn>5</mn></msub></math>&nbsp;which has two (-O-O-) bonds. Oxidation state of Cr in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>r</mi><msub><mi>O</mi><mn>5</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 06:16:48', NULL),
(251319, '85,80,239,915', '<p>The reaction of aqueous&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub><mo>&#160;</mo><mi>w</mi><mi>i</mi><mi>t</mi><mi>h</mi><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;in acidic conditions gives:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 06:19:27', NULL),
(251320, '85,80,239,915', '<p>Assuming complete ionization, same oles of which of the following compounds will require least amount of acidified&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;for complete oxidation:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 06:21:02', NULL),
(251321, '85,80,239,915', '<p>Which of the following processes does not involve oxidation of iron?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 07:59:40', NULL),
(251322, '85,80,239,915', '<p>Which one of the following statement is correct when&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is passed through acidified&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>K</mi><mn>2</mn></msub><mi>C</mi><msub><mi>r</mi><mn>2</mn></msub><msub><mi>O</mi><mn>7</mn></msub></math>&nbsp;solution?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:01:22', NULL),
(251323, '85,80,239,915', '<p>Name the gas that can readily decolourise acidified&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;solution:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:02:25', NULL),
(251324, '85,80,239,915', '<p>Which of the following statements is not true for halogens?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:04:56', NULL),
(251325, '85,80,239,915', '<p>Which of the following oxoacids of phosphorus has strongest reducing property?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:06:30', NULL),
(251326, '85,80,239,915', '<p>The oxidation state of Cr in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>r</mi><msub><mi>O</mi><mn>6</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:07:46', NULL),
(251327, '85,80,239,915', '<p>The correct structure of tribromooctaoxide:</p>\r\n\r\n<p><img alt=\"\" src=\"https://school.achievam.com/upload/questionbank/question/que_1755677331.png\" style=\"height:156px; width:353px\" /></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:09:06', NULL),
(251328, '85,80,239,915', '<p>Formula of nickel oxide with metal deficiency defect in its crystal is&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>i</mi><mrow><mn>0</mn><mo>.</mo><mn>98</mn></mrow></msub></math>O. The crystal contains&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msup><mi>i</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></math>&nbsp;and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msup><mi>i</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup></math>&nbsp;ions. The fraction of nickel existing as&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msup><mi>i</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></math>&nbsp;ions in the crystal is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:10:35', NULL),
(251329, '85,80,239,915', '<p>In a conjugate pair of reductant and oxidant, the oxidant has:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:13:45', NULL),
(251330, '85,80,239,915', '<p>Conversion of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>P</mi><mi>b</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;to PbS is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:14:23', NULL),
(251331, '85,80,239,915', '<p>In which&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;acts as oxidant, while reacting with:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:15:55', NULL),
(251332, '85,80,239,915', '<p>Which is not a redox reaction?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:18:06', NULL),
(251333, '85,80,239,915', '<p>Fluorine is a strong oxidising agent because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:19:01', NULL),
(251334, '85,80,239,915', '<p>Which acts as a reducing agent?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:20:09', NULL),
(251335, '85,80,239,915', '<p>In the reaction&nbsp;</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><mi>a</mi><mi>H</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>&#8594;</mo><mi>N</mi><mi>a</mi><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:21:17', NULL),
(251336, '85,80,239,915', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi></math>&nbsp;is passed through an acidified solution of copper sulphate and a black precipitate is formed. This is due to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:22:59', NULL),
(251337, '85,80,239,915', '<p>The colour of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>K</mi><mn>2</mn></msub><mi>C</mi><msub><mi>r</mi><mn>2</mn></msub><msub><mi>O</mi><mn>7</mn></msub></math>&nbsp;changes from red-orange to lemon-yellow on treatment with (aq) because of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doupdate', '2025-08-20 08:24:18', NULL),
(251338, '85,80,239,915', '<p>In the reaction;</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>2</mn><mi>A</mi><mi>g</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub><mo>&#8594;</mo><mi>A</mi><msub><mi>g</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub><mo>+</mo><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>S</mi><msub><mi>O</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;acts as:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:26:55', NULL),
(251339, '85,80,239,915', '<p>In which reaction is hdyrogen acting as an oxidising agent?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:28:06', NULL),
(251340, '85,80,239,915', '<p>The burning of hydrogen is called:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:28:34', NULL),
(251341, '85,80,239,915', '<p>The compound that can work both as an oxidising and reducing agent is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:29:44', NULL),
(251342, '85,80,239,915', '<p>In the reaction,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>Cr</mi><mn>2</mn></msub><msubsup><mi mathvariant=\"normal\">O</mi><mn>7</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>+</mo><mn>14</mn><msup><mi mathvariant=\"normal\">H</mi><mo>+</mo></msup><mo>+</mo><mn>6</mn><msup><mi mathvariant=\"normal\">I</mi><mo>-</mo></msup><mo>&#8594;</mo><mn>2</mn><msup><mi>Cr</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup><mo>+</mo><mn>7</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>3</mn><msub><mi mathvariant=\"normal\">I</mi><mn>2</mn></msub><mo>,</mo></math></p>\r\n\r\n<p>&nbsp;which element is reduced?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:30:52', NULL),
(251343, '85,80,239,915', '<p>Change of hydrogen into proton is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:31:31', NULL),
(251344, '85,80,239,915', '<p>In the preparation of chlorine from&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>H</mi><mi>C</mi><mi>l</mi><mo>,</mo><mo>&#160;</mo><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;acts as :</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:32:24', NULL),
(251345, '85,80,239,915', '<p>The reaction;&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>S</mi></math>&nbsp;shows:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:34:24', NULL),
(251346, '85,80,239,915', '<p>In the reaction of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>O</mi><mn>3</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>, the later acts as :</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:35:24', NULL),
(251347, '85,80,239,915', '<p>In which transfer of five electrons takes place?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:39:44', NULL),
(251348, '85,80,239,915', '<p>In the reaction,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mi mathvariant=\"normal\">C</mi><mo>+</mo><mn>4</mn><msub><mi>HNO</mi><mn>3</mn></msub><mo>&#8594;</mo><msub><mi>CO</mi><mn>2</mn></msub><mo>+</mo><mn>2</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>4</mn><msub><mi>NO</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>HNO</mi><mn>3</mn></msub></math>&nbsp;acts as:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:40:52', NULL),
(251349, '85,80,239,915', '<p>The reaction;&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>I</mi><mo>+</mo><msub><mi>I</mi><mn>2</mn></msub><mo>&#8594;</mo><mi>K</mi><msub><mi>I</mi><mn>3</mn></msub></math>&nbsp;shows:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:41:31', NULL),
(251350, '85,80,239,915', '<p>Which reaction does not involve either in oxidation or reduction?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:42:48', NULL),
(251351, '85,80,239,915', '<p>In which reaction&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;acts as a reducing agent?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:44:58', NULL),
(251352, '85,80,239,915', '<p>In the reaction:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>As</mi><mn>2</mn></msub><msub><mi mathvariant=\"normal\">S</mi><mn>3</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>HNO</mi><mn>3</mn></msub><mo>&#8594;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>3</mn></msub><msubsup><mi>AsO</mi><mrow><mn>4</mn><msup><mo>&#160;</mo><mo>.</mo></msup></mrow><mrow/></msubsup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><msub><mi>SO</mi><mn>4</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>NO</mi></math>,&nbsp;</p>\r\n\r\n<p>the element oxidisex is/are</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:46:54', NULL),
(251353, '85,80,239,915', '<p>In which of the following processes nitrogen is oxidised?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:48:41', NULL),
(251354, '85,80,239,915', '<p>Which is reducing agent in the reaction,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mn>8</mn><msup><mi mathvariant=\"normal\">H</mi><mo>+</mo></msup><mo>+</mo><mn>4</mn><msubsup><mi>NO</mi><mn>3</mn><mo>-</mo></msubsup><mo>+</mo><mn>6</mn><msup><mi>Cl</mi><mo>-</mo></msup><mo>+</mo><mi>Sn</mi><mo>(</mo><mi mathvariant=\"normal\">s</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><msubsup><mi>SnCl</mi><mn>6</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>+</mo><mn>4</mn><msub><mi>NO</mi><mn>2</mn></msub><mo>+</mo><mn>4</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:50:02', NULL),
(251355, '85,80,239,915', '<p>In the reaction,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mn>2</mn><msub><mi>KMnO</mi><mn>4</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>16</mn><mi>HCl</mi><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><mi>KCl</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msub><mi>MnCl</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>8</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mo>+</mo><mn>5</mn><msub><mi>Cl</mi><mn>2</mn></msub></math>,</p>\r\n\r\n<p>the reduction product is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:51:24', NULL);
INSERT INTO `questions` (`id`, `category_id`, `question`, `question_type`, `answer_type`, `subjective_ans`, `marks`, `time`, `added_by`, `status`, `current_url`, `created_at`, `updated_at`) VALUES
(251356, '85,80,239,915', '<p>The missing term in the following equation is:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mn>2</mn><msup><mi>Fe</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup><mo>&#160;</mo><mfenced><mi>aq</mi></mfenced><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msup><mi>Sn</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup><mo>(</mo><mi>aq</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><msup><mi>Fe</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup><mo>(</mo><mi>aq</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mo>?</mo></math></p>\r\n\r\n<p>&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:52:37', NULL),
(251357, '85,80,239,915', '<p>In the reaction,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>Na</mi><mn>2</mn></msub><msub><mi>CO</mi><mn>3</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><msub><mi>Na</mi><mn>2</mn></msub><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>CO</mi><mn>2</mn></msub><mo>+</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi></math>, the substance undergoing oxidation is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:54:01', NULL),
(251358, '85,80,239,915', '<p>Which of the following is not an example of redox reaction?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:55:38', NULL),
(251359, '85,80,239,915', '<p>The decomposition of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>KClO</mi><mn>3</mn></msub></math>&nbsp;to KCl and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;on heating is an example of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:57:14', NULL),
(251360, '85,80,239,915', '<p>In the following reaction:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mn>4</mn><mi mathvariant=\"normal\">P</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>3</mn><mi>KOH</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>3</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>&#160;</mo><mo>&#8594;</mo><mn>3</mn><msub><mi>KH</mi><mn>2</mn></msub><msub><mi>PO</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>PH</mi><mn>3</mn></msub></math>:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 08:58:20', NULL),
(251361, '85,80,239,915', '<p>Which of the following change represents a disproportionation reaction (s)?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 09:00:40', NULL),
(251362, '85,80,239,915', '<p>The oxidation number of phosphorus in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi><mi>a</mi><msub><mrow><mo>(</mo><msub><mi>H</mi><mn>2</mn></msub><mi>P</mi><msub><mi>O</mi><mn>2</mn></msub><mo>)</mo></mrow><mn>2</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 09:03:22', NULL),
(251363, '85,80,239,915', '<p>The oxidation states of the most electronegative element in the products of the reactin between&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi><mi>a</mi><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 09:04:14', NULL),
(251364, '85,80,239,915', '<p>The number of mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>KMnO</mi><mn>4</mn></msub></math>&nbsp;that will be needed to react completely with one mol of ferrous oxalate in acidic solution is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 09:05:10', NULL),
(251365, '85,80,239,915', '<p>The number of mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;that will be needed to react with one mole of sulphite ion in acidic solution is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-20 09:05:53', NULL),
(251366, '85,80,239,915', '<p>The oxidation number of sulphur in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>S</mi><mn>8</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>S</mi><mn>2</mn></msub><msub><mi>F</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi></math>&nbsp;respectively are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 01:58:15', NULL),
(251367, '85,80,239,915', '<p>Among the following identify the species with an atom in +6 oxidation state:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:00:05', NULL),
(251368, '85,80,239,915', '<p>The reaction,</p>\r\n\r\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mn>3</mn><msup><mi>CIO</mi><mo>-</mo></msup><mfenced><mi>aq</mi></mfenced><mo>&#8594;</mo><msubsup><mi>CIO</mi><mn>3</mn><mo>-</mo></msubsup><mfenced><mi>aq</mi></mfenced><mo>+</mo><mn>2</mn><msup><mi>Cl</mi><mo>-</mo></msup><mfenced><mi>aq</mi></mfenced></math>&nbsp;is an example of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:01:40', NULL),
(251369, '85,80,239,915', '<p>In the standardization of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>a</mi><mn>2</mn></msub><msub><mi>S</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub><mo>&#160;</mo><mi>u</mi><mi>sin</mi><mi>g</mi><mo>&#160;</mo><msub><mi>K</mi><mn>2</mn></msub><mi>C</mi><msub><mi>r</mi><mn>2</mn></msub><msub><mi>O</mi><mn>7</mn></msub></math>&nbsp;by iodometry, the equivalent mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><msub><mi>r</mi><mn>2</mn></msub><mi>C</mi><msub><mi>r</mi><mn>2</mn></msub><msub><mi>O</mi><mn>7</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:03:16', NULL),
(251370, '85,80,239,915', '<p>When&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;acts as an oxidising agent and ultimately forms&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>MnO</mi><mn>4</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>,</mo><mo>&#160;</mo><msub><mi>MnO</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>Mn</mi><mn>2</mn></msub><msub><mi mathvariant=\"normal\">O</mi><mn>3</mn></msub><mo>&#160;</mo><mi>and</mi><mo>&#160;</mo><msup><mi>Mn</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></math>, then the number of electrons transferred in each case respectively is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:05:24', NULL),
(251371, '85,80,239,915', '<p>Which of the following is a redox reaction?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:08:01', NULL),
(251372, '85,80,239,915', '<p>Which reaction is possible at anode?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:09:45', NULL),
(251373, '85,80,239,915', '<p>The oxidation number of Cl in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>a</mi><mi>O</mi><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></math>&nbsp;(bleaching powder) is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:11:45', NULL),
(251374, '85,80,239,915', '<p>The oxidation number of Ni in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>K</mi><mn>4</mn></msub><mfenced open=\"[\" close=\"]\"><mrow><mi>N</mi><mi>i</mi><msub><mfenced><mrow><mi>C</mi><mi>N</mi></mrow></mfenced><mn>4</mn></msub></mrow></mfenced></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:12:49', NULL),
(251375, '85,80,239,915', '<p>Excess of KI reacts with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>u</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;solution and then&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>a</mi><mn>2</mn></msub><msub><mi>S</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;solution is added to it. Which of the statement is incorrect in this reaction?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:15:12', NULL),
(251376, '85,80,239,915', '<p>Among the properties (a) reducing, (b) oxidising and (c) complexing the set of properties shown by&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msup><mi>N</mi><mo>-</mo></msup></math>&nbsp;ion towards metal species is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:16:16', NULL),
(251377, '85,80,239,915', '<p>Maximum oxidation state is present in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:17:50', NULL),
(251378, '85,80,239,915', '<p>Among the properties given below, the set of properties shown by&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msup><mi>N</mi><mo>-</mo></msup></math>&nbsp;ion towards metal species is:</p>\r\n\r\n<p>1. Reducing; 2. Oxidising; 3 Complexation</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:19:02', NULL),
(251379, '85,80,239,915', '<p>The oxidation state of Cr in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mfenced open=\"[\" close=\"]\"><mrow><mi>C</mi><mi>r</mi><msub><mfenced><mrow><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub></mrow></mfenced><mn>4</mn></msub><mi>C</mi><msub><mi>I</mi><mn>2</mn></msub></mrow></mfenced><mo>+</mo></msup></math>&nbsp;is</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:19:47', NULL),
(251380, '85,80,239,915', '<p>The oxidation stae of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:20:31', NULL),
(251381, '85,80,239,915', '<p>Which of the following chemical reaction depicts the oxidizing behaviour of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:23:52', NULL),
(251382, '85,80,239,915', '<p>The number of moles of Mohr&#39;s salt required per mole of dichromate ion is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:24:23', NULL),
(251383, '85,80,239,915', '<p>Amount of oxalic acid present in a solution can be determined by its titration with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;solution in the presence of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>. The titration gives unsatisfactory result when carried out in the presence of HCI, because HCI:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:26:54', NULL),
(251384, '85,80,239,915', '<p>Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:29:23', NULL),
(251385, '85,80,239,915', '<p>The reaction of white phosphorus with aqueous NaOH gives phosphine along with another phosphorus containing compound. The reaction type; the oxidation states of phosphorus in phosphine and the other product are respectively:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:32:07', NULL),
(251386, '85,80,239,915', '<p>Consider the following reaction:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msubsup><mi>xMnO</mi><mn>4</mn><mo>-</mo></msubsup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>yC</mi><mn>2</mn></msub><msubsup><mi mathvariant=\"normal\">O</mi><mn>4</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msup><mi>zH</mi><mo>+</mo></msup><mo>&#160;</mo><mo>&#8594;</mo><mi>x</mi><mi>M</mi><msup><mi>n</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><mi>y</mi><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mfrac><mi>z</mi><mn>2</mn></mfrac><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></math></p>\r\n\r\n<p>The values of x, y and z in the reaction are respectively:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:33:55', NULL),
(251387, '85,80,239,915', '<p>Experimentally it was found that a metal oxide has formula&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>M</mi><mrow><mn>0</mn><mo>.</mo><mn>98</mn></mrow></msub><mi>O</mi></math>. Metal M, is present as&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>M</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msup><mi>M</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup></math>&nbsp;in its oxide. Fraction of the metal which exists as&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>M</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup></math>&nbsp;would be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:35:39', NULL),
(251388, '85,80,239,915', '<p>In which of the following reactions&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;acts as a reducing agent?</p>\r\n\r\n<p><math class=\"wrs_chemistry\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mi mathvariant=\"normal\">i</mi></mfenced><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msup><mi>H</mi><mo>+</mo></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msup><mi>e</mi><mo>-</mo></msup><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mspace linebreak=\"newline\"/><mo>(</mo><mi>ii</mi><mo>)</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mn>2</mn><msup><mi mathvariant=\"normal\">e</mi><mo>-</mo></msup><mo>&#160;</mo><mo>&#8594;</mo><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msup><mi mathvariant=\"normal\">H</mi><mo>+</mo></msup><mspace linebreak=\"newline\"/><mo>(</mo><mi>iii</mi><mo>)</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msup><mi mathvariant=\"normal\">e</mi><mo>-</mo></msup><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><msup><mi>OH</mi><mo>-</mo></msup><mspace linebreak=\"newline\"/><mo>(</mo><mi>iv</mi><mo>)</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msup><mi>OH</mi><mo>-</mo></msup><mo>&#160;</mo><mo>-</mo><mn>2</mn><msup><mi mathvariant=\"normal\">e</mi><mo>-</mo></msup><mo>&#160;</mo><mo>&#8594;</mo><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:38:50', NULL),
(251389, '85,80,239,915', '<p>Hydrogen peroxide in its reaction with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>I</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mi>H</mi></math>&nbsp;respectively, is acting as a :</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:41:02', NULL),
(251390, '85,80,239,915', '<p>In the reaction of oxalate with permanganate in acidic solution, the number of electrons involved in producing one molecule of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:42:07', NULL),
(251391, '85,80,239,915', '<p>In order to oxidise a mixture of one mole each of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><mi>e</mi><msub><mi>C</mi><mn>2</mn></msub><msub><mi>O</mi><mn>4</mn></msub><mo>,</mo><mo>&#160;</mo><mi>F</mi><msub><mi>e</mi><mn>2</mn></msub><msub><mfenced><mrow><msub><mi>C</mi><mn>2</mn></msub><msub><mi>O</mi><mn>4</mn></msub></mrow></mfenced><mn>3</mn></msub><mo>,</mo><mo>&#160;</mo><mi>F</mi><mi>e</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>F</mi><msub><mi>e</mi><mn>2</mn></msub><msub><mfenced><mrow><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></mrow></mfenced><mn>3</mn></msub></math>&nbsp;number of moles of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;required is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:43:38', NULL),
(251392, '85,80,239,915', '<p>The correct order of the oxidation state of nitrogen in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><mi>O</mi><mo>,</mo><mo>&#160;</mo><mi>N</mi><msub><mi>o</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>N</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>N</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:46:35', NULL),
(251393, '85,80,239,915', '<p>Highest possible oxidation states of uranium and plutonium are respectively:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:47:11', NULL),
(251394, '85,80,239,915', '<p>Which of the following cannot act as both oxidising and reducing agent?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:48:52', NULL),
(251395, '85,80,239,915', '<p>Among the following which is redox reaction?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 02:51:09', NULL),
(251396, '85,80,239,915', '<p>Oxidation state of potassium in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>K</mi><mn>2</mn></msub><mi>O</mi><mo>,</mo><mo>&#160;</mo><msub><mi>K</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mo>&#160;</mo><mi>K</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;are respectively:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 04:55:10', NULL),
(251397, '85,80,239,915', '<p>An example of disproportionation is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 04:58:18', NULL),
(251398, '85,80,239,915', '<p>The oxidation state of +3 for phosphorus is in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 05:03:35', NULL),
(251399, '85,80,239,915', '<p>The ox. no. of S in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>a</mi><mn>2</mn></msub><msub><mi>S</mi><mn>4</mn></msub><msub><mi>O</mi><mn>6</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 05:05:16', NULL),
(251400, '85,80,239,915', '<p>Which among the following shows maximum oxidation state?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 05:05:48', NULL),
(251401, '85,80,239,915', '<p>Which substance serves as a reducing agent in the following reaction,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mn>14</mn><msup><mi mathvariant=\"normal\">H</mi><mo>+</mo></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>Cr</mi><mn>2</mn></msub><msubsup><mi mathvariant=\"normal\">O</mi><mn>7</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>+</mo><mn>3</mn><mi>Ni</mi><mo>&#8594;</mo><mn>2</mn><msup><mi>Cr</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup><mo>+</mo><mn>7</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>3</mn><msup><mi>Ni</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 05:07:20', NULL),
(251402, '85,80,239,915', '<p>The oxidation state of I in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi mathvariant=\"normal\">H</mi><mn>4</mn></msub><msubsup><mi>IO</mi><mn>6</mn><mo>-</mo></msubsup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 05:07:52', NULL),
(251403, '85,80,239,915', '<p>The oxide, which cannot act as a reducing agent is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 05:08:36', NULL),
(251404, '85,80,239,915', '<p>In the reaction,&nbsp;</p>\r\n\r\n<p><math class=\"wrs_chemistry\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>3</mn><msub><mi>Br</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>6</mn><msubsup><mi>CO</mi><mn>3</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>+</mo><mn>3</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>&#8594;</mo><mn>5</mn><msup><mi>Br</mi><mo>-</mo></msup><mo>+</mo><msubsup><mi>BrO</mi><mn>3</mn><mo>-</mo></msubsup><mo>+</mo><mn>6</mn><msubsup><mi>HCO</mi><mn>3</mn><mo>-</mo></msubsup></math></p>\r\n\r\n<p>which statement is correct?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 05:22:40', NULL),
(251405, '85,80,239,915', '<p>Identify disproportionation reaction:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:12:06', NULL),
(251406, '85,80,239,915', '<p>Which of the following elements does not show disproportiionation tendency?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:12:49', NULL),
(251407, '85,80,239,915', '<p>The reaction&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mn>2</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">S</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>SO</mi><mn>2</mn></msub><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mn>3</mn><mi mathvariant=\"normal\">S</mi><mo>(</mo><mi mathvariant=\"normal\">s</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>(</mo><mi mathvariant=\"normal\">l</mi><mo>)</mo></math>&nbsp;is an example of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:14:38', NULL),
(251408, '85,80,239,915', '<p>The reaction&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>F</mi><mn>2</mn></msub><mo>&#8594;</mo><mi>H</mi><mi>F</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>H</mi><mi>O</mi><mi>F</mi></math>&nbsp;is an example of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:16:30', NULL),
(251409, '85,80,239,915', '<p>Which of the following shows highest ox. no. in combined state?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:17:03', NULL),
(251410, '85,80,239,915', '<p>Oxidation number of carbon in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>C</mi><mn>3</mn></msub><msub><mi>O</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><mi>M</mi><msub><mi>g</mi><mn>2</mn></msub><msub><mi>C</mi><mn>3</mn></msub></math>&nbsp;are respectively:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:18:17', NULL),
(251411, '85,80,239,915', '<p>It is found that V forms a double salt isomorphous with Mohr&#39;s salt. The oxidation number of V in this compound is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:19:06', NULL),
(251412, '85,80,239,915', '<p>In which iron has the lowest oxidation state?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:20:47', NULL),
(251413, '85,80,239,915', '<p>The oxidation number and covalency of sulphur in the sulphur molecule&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><msub><mi>S</mi><mn>8</mn></msub></mfenced></math>&nbsp;are respectively:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:22:21', NULL),
(251414, '85,80,239,915', '<p>The most common oxidation state of an element is -2. The number of electrons present in its outermost shell is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:22:56', NULL),
(251415, '85,80,239,915', '<p>In the reaction,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>2</mn><mi>N</mi><msub><mi>a</mi><mn>2</mn></msub><msub><mi>S</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>I</mi><mn>2</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><mi>N</mi><msub><mi>a</mi><mn>2</mn></msub><msub><mi>S</mi><mn>4</mn></msub><msub><mi>O</mi><mn>6</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><mi>N</mi><mi>a</mi><mi>I</mi></math>, the oxidation state of sulphur is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:34:46', NULL),
(251416, '85,80,239,915', '<p>Oxidation state of +1 for phosphorus is found in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:37:01', NULL),
(251417, '85,80,239,915', '<p>In&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>CH</mi><mn>2</mn></msub><msub><mi>Cl</mi><mn>2</mn></msub></math>, the oxidation number of C is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:37:34', NULL),
(251418, '85,80,239,915', '<p>The oxidation number of sulphur in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>S</mi><mn>2</mn></msub><msub><mi>O</mi><mn>8</mn></msub></math>&nbsp;is</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:38:18', NULL),
(251419, '85,80,239,915', '<p>A compound contains atoms X, Y, Z. The oxidation number of X is +2, Y is +5 and Z is -2. The possible formula of the compound is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:49:05', NULL),
(251420, '85,80,239,915', '<p>Oxidation number of carbon in KCN is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:49:32', NULL),
(251421, '85,80,239,915', '<p>The oxidation number of Cr in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mfenced open=\"[\" close=\"]\"><mrow><mi>C</mi><mi>r</mi><msub><mfenced><mrow><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub></mrow></mfenced><mn>4</mn></msub><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></mrow></mfenced><mo>+</mo></msup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:50:12', NULL),
(251422, '85,80,239,915', '<p>The oxidation state of hydrogen in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>a</mi><msub><mi>H</mi><mn>2</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:50:54', NULL),
(251423, '85,80,239,915', '<p>Oxidation number of Cl in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>a</mi><mi>O</mi><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:51:53', NULL),
(251424, '85,80,239,915', '<p>When SN(IV) chloride is treated with excess HCl, the complex&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mfenced open=\"[\" close=\"]\"><msub><mi>SnCl</mi><mn>6</mn></msub></mfenced><mrow><mn>2</mn><mo>-</mo></mrow></msup></math>&nbsp;is formed. The oxidation state of Sn in this complex is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:53:02', NULL),
(251425, '85,80,239,915', '<p>Oxidation state of oxygen atom in potassium superoxide&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mrow><mi>K</mi><msub><mi>O</mi><mn>2</mn></msub></mrow></mfenced></math>&nbsp;is :</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:53:47', NULL),
(251426, '85,80,239,915', '<p>If three electrons are lost by a metal ion&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>M</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup></math>, its final oxidation number will be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:54:37', NULL),
(251427, '85,80,239,915', '<p>Oxidation number of N in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi mathvariant=\"normal\">N</mi><mn>3</mn></msub><mi mathvariant=\"normal\">H</mi></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:55:09', NULL),
(251428, '85,80,239,915', '<p>Oxidation number of S in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>S</mi><mn>2</mn></msub><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:55:56', NULL),
(251429, '85,80,239,915', '<p>The oxidation number of Fe in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>K</mi><mn>4</mn></msub><mi>F</mi><mi>e</mi><msub><mrow><mo>(</mo><mi>C</mi><mi>N</mi><mo>)</mo></mrow><mn>6</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 06:56:41', NULL),
(251430, '85,80,239,915', '<p>Carbon is in the lowest oxidation state in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:03:25', NULL),
(251431, '85,80,239,915', '<p>Oxidation state of oxygen is -1 in the compound:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:04:30', NULL),
(251432, '85,80,239,915', '<p>When&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is passe in acidified potassium dichromate solution, the oxidation state of S is changed from:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:05:29', NULL),
(251433, '85,80,239,915', '<p>The oxidation state of nitrogen in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>H</mi><mn>4</mn></msub><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:06:14', NULL),
(251434, '85,80,239,915', '<p>The oxidation number of nitrogen in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mi>H</mi></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:06:47', NULL),
(251435, '85,80,239,915', '<p>Nitrogen has fractional oxidation number in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:07:38', NULL),
(251436, '85,80,239,915', '<p>Oxidation number of Cr in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>r</mi><msub><mi>O</mi><mn>5</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:08:06', NULL),
(251437, '85,80,239,915', '<p>Oxidation number of carbon in carbon suboxide is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:08:36', NULL),
(251438, '85,80,239,915', '<p>Oxidation number of S in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mfenced><mrow><mi>C</mi><msub><mi>H</mi><mn>3</mn></msub></mrow></mfenced><mn>2</mn></msub></math>SO is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:09:52', NULL),
(251439, '85,80,239,915', '<p>Oxidation number of Cl in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><mi>O</mi><mi>C</mi><mi>l</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:14:42', NULL),
(251440, '85,80,239,915', '<p>Oxidation number of Fe in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>a</mi><mn>2</mn></msub><mfenced open=\"[\" close=\"]\"><mrow><mi>F</mi><mi>e</mi><msub><mfenced><mrow><mi>C</mi><mi>N</mi></mrow></mfenced><mn>5</mn></msub><mi>N</mi><mi>O</mi></mrow></mfenced></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:15:19', NULL),
(251441, '85,80,239,915', '<p>The&nbsp; oxidation number of arsenic in arsenate is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:15:40', NULL),
(251442, '85,80,239,915', '<p>Oxidation number of sodium in sodium amalgam is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:16:02', NULL),
(251443, '85,80,239,915', '<p>Oxidation state of carbon in graphite is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:16:35', NULL),
(251444, '85,80,239,915', '<p>Oxidation number of Fe in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><msub><mi>e</mi><mrow><mn>0</mn><mo>.</mo><mn>94</mn></mrow></msub><mi>O</mi></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:17:39', NULL),
(251445, '85,80,239,915', '<p>Oxidation numbers of Fe in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><msub><mi>e</mi><mn>3</mn></msub><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:18:11', NULL),
(251446, '85,80,239,915', '<p>Oxidation number of C in HNC is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:18:36', NULL),
(251447, '85,80,239,915', '<p>In the equation,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>NO</mi><mn>2</mn><mo>-</mo></msubsup><mo>+</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>&#160;</mo><mo>&#8594;</mo><msubsup><mi>NO</mi><mn>3</mn><mo>-</mo></msubsup><mo>+</mo><mn>2</mn><msup><mi mathvariant=\"normal\">H</mi><mo>+</mo></msup><mo>+</mo><msup><mi>ne</mi><mo>-</mo></msup></math>&nbsp;</p>\r\n\r\n<p>n stands for:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:20:08', NULL),
(251448, '85,80,239,915', '<p>The value of n in,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>MnO</mi><mn>4</mn><mo>-</mo></msubsup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>8</mn><msup><mi mathvariant=\"normal\">H</mi><mo>+</mo></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>ne</mi><mo>&#160;</mo><mo>&#8594;</mo><msup><mi>Mn</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>4</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:20:56', NULL),
(251449, '85,80,239,915', '<p>One mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>N</mi><mn>2</mn></msub><msub><mi>H</mi><mn>4</mn></msub></math>&nbsp;loses 10 mole of electrons to form a new compound Y. Assuming that all nitrogen appears in the new compound, what is the oxidation number of nitrogen in Y (There is no change in the oxidation state of hydrogen)?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:22:21', NULL),
(251450, '85,80,239,915', '<p>In the reaction,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>3</mn></msub><mi>O</mi><mi>H</mi><mo>&#8594;</mo><mi>H</mi><mi>C</mi><mi>O</mi><mi>O</mi><mi>H</mi></math>, the number of electrons that must be added to the right is :</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:22:57', NULL),
(251451, '85,80,239,915', '<p>In balancing the half reaction&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi mathvariant=\"normal\">S</mi><mn>2</mn></msub><msubsup><mi mathvariant=\"normal\">O</mi><mn>3</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>&#160;</mo><mo>&#8594;</mo><mi mathvariant=\"normal\">S</mi><mo>(</mo><mi mathvariant=\"normal\">s</mi><mo>)</mo></math>, the number of electrons that must be added is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:23:55', NULL),
(251452, '85,80,239,915', '<p>The eq. mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>a</mi><mn>2</mn></msub><msub><mi>S</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;as reductant, in the reaction,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>a</mi><mn>2</mn></msub><msub><mi>S</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>5</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>4</mn><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub><mo>&#8594;</mo><mn>2</mn><mi>N</mi><mi>a</mi><mi>H</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>8</mn><mi>H</mi><mi>C</mi><mi>l</mi></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:32:32', NULL),
(251453, '85,80,239,915', '<p>The eq. mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><msub><mi>e</mi><mn>2</mn></msub><msub><mfenced><mrow><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></mrow></mfenced><mn>3</mn></msub></math>, the salt to be used as an oxidant in an acidic solution is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:34:10', NULL),
(251454, '85,80,239,915', '<p>The eq. mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;in the reaction,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>MnO</mi><mn>4</mn><mo>-</mo></msubsup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msup><mi>Mn</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>&#8594;</mo><msub><mi>MnO</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msup><mi mathvariant=\"normal\">H</mi><mo>+</mo></msup></math>&nbsp;(unbalanced) is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:35:44', NULL),
(251455, '85,80,239,915', '<p>In the reaction,&nbsp;</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>N</mi><mn>2</mn></msub><mo>&#8594;</mo><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub></math></p>\r\n\r\n<p>The eq. mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>N</mi><mn>2</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub></math>&nbsp;are respectively equal to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:48:56', NULL),
(251456, '85,80,239,915', '<p>In the reaction,</p>\r\n\r\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>V</mi><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>F</mi><msub><mi>e</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub><mo>&#8594;</mo><mi>F</mi><mi>e</mi><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>V</mi><mn>2</mn></msub><msub><mi>O</mi><mn>5</mn></msub></math></p>\r\n\r\n<p>The eq. mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>V</mi><mn>2</mn></msub><msub><mi>O</mi><mn>5</mn></msub></math>&nbsp;is equal to its:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:50:31', NULL),
(251457, '85,80,239,915', '<p>The eq. mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>FeC</mi><mn>2</mn></msub><msub><mi mathvariant=\"normal\">O</mi><mn>4</mn></msub></math>&nbsp;in,</p>\r\n\r\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><mi>e</mi><msub><mi>C</mi><mn>2</mn></msub><msub><mi>O</mi><mn>4</mn></msub><mo>&#8594;</mo><mi>F</mi><msup><mi>e</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:51:50', NULL),
(251458, '85,80,239,915', '<p>In the following change,&nbsp;</p>\r\n\r\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>3</mn><mi>F</mi><mi>e</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>4</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mo>&#8594;</mo><mi>F</mi><msub><mi>e</mi><mn>3</mn></msub><msub><mi>O</mi><mn>4</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>4</mn><msub><mi>H</mi><mn>2</mn></msub></math></p>\r\n\r\n<p>If the atomic mass of iron is 56, then its equivalent mass will be:</p>\r\n\r\n<p>&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:53:53', NULL),
(251459, '85,80,239,915', '<p>The equivalent mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><mi>n</mi><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></math>&nbsp;in the reaction,</p>\r\n\r\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><mi>n</mi><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub><mo>&#8594;</mo><mi>S</mi><mi>n</mi><mi>C</mi><msub><mi>l</mi><mn>4</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:54:59', NULL),
(251460, '85,80,239,915', '<p>In the equation,</p>\r\n\r\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><mi>H</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><mi>N</mi><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>S</mi></math></p>\r\n\r\n<p>The equivalent mass of hydrogen sulphide is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:56:02', NULL),
(251461, '85,80,239,915', '<p>The equivalent mass of iron in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><msub><mi>e</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;would be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:56:32', NULL),
(251462, '85,80,239,915', '<p>The equivalent mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;(acidic medium) is (at, mass of K = 39; Mn = 55):</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:57:47', NULL),
(251463, '85,80,239,915', '<p>The equivalent mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>MnSO</mi><mn>4</mn></msub></math>&nbsp;is half of its molar mass when it is converted to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 07:59:03', NULL),
(251464, '85,80,239,915', '<p>Equivalent mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>a</mi><mn>2</mn></msub><msub><mi>S</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;in its reaction with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>I</mi><mn>2</mn></msub></math>&nbsp;is equal to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:01:26', NULL),
(251465, '85,80,239,915', '<p>When&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>BrO</mi><mn>3</mn><mo>-</mo></msubsup></math>&nbsp;ion reacts with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi><msup><mi>r</mi><mo>-</mo></msup></math>&nbsp;ion in acidic solution&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi><msub><mi>r</mi><mn>2</mn></msub></math>&nbsp;is liberated. The equivalent mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>B</mi><mi>r</mi><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:02:33', NULL);
INSERT INTO `questions` (`id`, `category_id`, `question`, `question_type`, `answer_type`, `subjective_ans`, `marks`, `time`, `added_by`, `status`, `current_url`, `created_at`, `updated_at`) VALUES
(251466, '85,80,239,915', '<p>The anion nitrate is converted into ammonium ion. The equivalent mass of nitrate ion in the reaction would be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:03:08', NULL),
(251467, '85,80,239,915', '<p>For the reaction:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>N</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>3</mn><msub><mi>H</mi><mn>2</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub></math>;</p>\r\n\r\n<p>If&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>E</mi><mn>1</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>E</mi><mn>2</mn></msub></math>&nbsp;are equivalent masses of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>N</mi><mn>2</mn></msub></math>&nbsp;&nbsp;respectively, then&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>E</mi><mn>1</mn></msub><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><msub><mi>E</mi><mn>2</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:04:52', NULL),
(251468, '85,80,239,915', '<p>Equivalent mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>IO</mi><mn>4</mn><mo>-</mo></msubsup></math>&nbsp;when it is converted to&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>I</mi><mn>2</mn></msub></math>&nbsp;in acid medium:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:06:50', NULL),
(251469, '85,80,239,915', '<p>Equivalent mass of oxidising agent in the reaction.</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><mo>&#8594;</mo><mn>3</mn><mi>S</mi><mo>+</mo><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:07:32', NULL),
(251470, '85,80,239,915', '<p>In alkaline condition&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;reacts as follows,</p>\r\n\r\n<p>&nbsp; &nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>2</mn><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><mi>K</mi><mi>O</mi><mi>H</mi><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><msub><mi>K</mi><mn>2</mn></msub><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>O</mi></math></p>\r\n\r\n<p>Therefore, its equivalent mass will be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:08:42', NULL),
(251471, '85,80,239,915', '<p>Eq. mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub></math>&nbsp;in,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><mi>N</mi><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>:</mo></math></p>\r\n\r\n<p>&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:09:45', NULL),
(251472, '85,80,239,915', '<p>The eq. mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>I</mi><mn>2</mn></msub></math>&nbsp;in the change&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi mathvariant=\"normal\">I</mi><mn>2</mn></msub><mo>&#8594;</mo><mi>I</mi><msubsup><mi>O</mi><mn mathvariant=\"italic\">3</mn><mo mathvariant=\"italic\">-</mo></msubsup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:11:00', NULL),
(251473, '85,80,239,915', '<p>In the reaction,</p>\r\n\r\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi mathvariant=\"normal\">I</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msub><mi mathvariant=\"normal\">S</mi><mn>2</mn></msub><msubsup><mi mathvariant=\"normal\">O</mi><mn>3</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>&#8594;</mo><mn>2</mn><msup><mi mathvariant=\"normal\">I</mi><mo>-</mo></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">S</mi><mn>4</mn></msub><msubsup><mi mathvariant=\"normal\">O</mi><mn>6</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup></math></p>\r\n\r\n<p>Equivalent mass of iodine will be equal to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:12:25', NULL),
(251474, '85,80,239,915', '<p>Starch gives blue colour with:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:13:02', NULL),
(251475, '85,80,239,915', '<p>Titrations in which&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>I</mi><mn>2</mn></msub></math>&nbsp;solution is used as intermediate are known as.........titration.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:13:53', NULL),
(251476, '85,80,239,915', '<p>Volumetric estimation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>u</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;using hypo as intermediate solution along with KI solution and starch as indicator is an example of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:18:05', NULL),
(251477, '85,80,239,915', '<p>Reaction of acidified&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;with ferrous oxale gives oxidation products containing:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:19:25', NULL),
(251478, '85,80,239,915', '<p>Titration of KI with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;in presence of acid is a :</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:20:08', NULL),
(251479, '85,80,239,915', '<p>In the titration of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>u</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;vs. hypo in presence of KI, which statement is wrong?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:22:21', NULL),
(251480, '85,80,239,915', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>u</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;and KI on mixing gives:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:24:51', NULL),
(251481, '85,80,239,915', '<p>In the reduction of dichromate of Fe(II), the number of electrons involved per chromium atom is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:25:26', NULL),
(251482, '85,80,239,915', '<p>When&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;acts as an oxidising agent ultimately forms&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>MnO</mi><mn>4</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>,</mo><mo>&#160;</mo><msub><mi>MnO</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>Mn</mi><mn>2</mn></msub><msub><mi mathvariant=\"normal\">O</mi><mn>3</mn></msub><mo>&#160;</mo><mi>and</mi><mo>&#160;</mo><msup><mi>Mn</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></math>, then the number of electrons transferred in each case respectively is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:27:07', NULL),
(251483, '85,80,239,915', '<p>How many gram of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;should be taken to make up 250 mL of a solution of such strength that 1 mL is equivalent to 5.0 mg of Fe in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><mi>e</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:32:39', NULL),
(251484, '85,80,239,915', '<p>How many gram of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>I</mi><mn>2</mn></msub></math>&nbsp;are present in a solution which requires 40 mL, of 0.11N&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>a</mi><mn>2</mn></msub><msub><mi>S</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;to react with it,</p>\r\n\r\n<p><math class=\"wrs_chemistry\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi mathvariant=\"normal\">S</mi><mn>2</mn></msub><msubsup><mi mathvariant=\"normal\">O</mi><mn>3</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>+</mo><msub><mi mathvariant=\"normal\">I</mi><mn>2</mn></msub><mo>&#8594;</mo><msub><mi mathvariant=\"normal\">S</mi><mn>4</mn></msub><msubsup><mi mathvariant=\"normal\">O</mi><mn>6</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>+</mo><mn>2</mn><msup><mi mathvariant=\"normal\">I</mi><mo>-</mo></msup></math>?&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:35:59', NULL),
(251485, '85,80,239,915', '<p>What mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is reduced by 35 mL of 0.16 N oxalic acid in acidic solution? The skelton equation is,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msup><mi>H</mi><mo>+</mo></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><msub><mi>C</mi><mn>2</mn></msub><msub><mi>O</mi><mn>4</mn></msub><mo>&#8594;</mo><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>+</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>+</mo><mi>M</mi><msup><mi>n</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></p>\r\n\r\n<p>&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:41:25', NULL),
(251486, '85,80,239,915', '<p>What mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><mi>e</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;(molar mass = 152) will be oxidised by 200 mL of normal&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;solution in acidic solution?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:42:24', NULL),
(251487, '85,80,239,915', '<p>25 mL of 0.50M&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;solution is added to 50 mL of 0.20 M&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;in acidic solution. Which of the following statements is true?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:44:37', NULL),
(251488, '85,80,239,915', '<p>What volume of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;measured at standard conditions will be formed by the action of 100 mL of 0.5 N&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;on hydrogen peroxide in an acidic solution? The skeleton equation for the reaction is,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub><mo>+</mo><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub><mo>&#8594;</mo><mi>K</mi><mi>H</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub><mo>&#160;</mo><mo>+</mo><mi>M</mi><mi>n</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>O</mi><mn>2</mn></msub></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 08:49:53', NULL),
(251489, '85,80,239,915', '<p>What volume of 0.40 M&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>a</mi><mn>2</mn></msub><msub><mi>S</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;would be required to react with the&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>I</mi><mn>2</mn></msub></math>&nbsp;liberated by adding excess of KI to 50 mL of 0.20 M&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>u</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;solution?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 16:43:14', NULL),
(251490, '85,80,239,915', '<p>What volume of 2N&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>K</mi><mn>2</mn></msub><mi>C</mi><msub><mi>r</mi><mn>2</mn></msub><msub><mi>O</mi><mn>7</mn></msub></math>&nbsp;solution is required to oxidise 0.81g of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi></math>&nbsp;in acidic medium?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 16:44:30', NULL),
(251491, '85,80,239,915', '<p>The number of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><msup><mi>e</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></math>&nbsp;ion oxidised by one mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>MnO</mi><mn>4</mn><mo>-</mo></msubsup></math>&nbsp;ions is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 16:45:16', NULL),
(251492, '85,80,239,915', '<p>What mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>H</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;is needed to convert 5g of iodine into iodic acid according to the reaction,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>I</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>H</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><mi>H</mi><mi>I</mi><msub><mi>O</mi><mn>3</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>N</mi><msub><mi>O</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 16:46:39', NULL),
(251493, '85,80,239,915', '<p>How many litre of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></math>&nbsp;at STP will be liberated by the oxidation of NaCl with 10g&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 16:47:52', NULL),
(251494, '85,80,239,915', '<p>The number of mole of potassium salt, i.e.,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>H</mi><msub><mi>C</mi><mn>2</mn></msub><msub><mi>O</mi><mn>4</mn></msub><mo>&#160;</mo><mo>.</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><msub><mi>C</mi><mn>2</mn></msub><msub><mi>O</mi><mn>4</mn></msub><mo>&#160;</mo><mo>.</mo><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></math>&nbsp;oxidised by one mole of permanganate ion is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 16:49:43', NULL),
(251495, '85,80,239,915', '<p>What volume of 0.1 N oxalic acid solution can be reduced by 250g of an 8 percent by mass&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;solution?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 16:50:44', NULL),
(251496, '85,80,239,915', '<p>The number of mole of ferrous oxalate oxidised by one mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 16:51:39', NULL),
(251497, '85,80,239,915', '<p>How many gram of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;are contained in 4 litre of 0.05 N solution? The&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;is to be used as an oxidant in acidic medium:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-21 16:53:07', NULL),
(251498, '85,80,239,915', '<p>When the ion&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>Cr</mi><mn>2</mn></msub><msubsup><mi mathvariant=\"normal\">O</mi><mn>7</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup></math>&nbsp;acts as an oxidant in acidic aqueous solution the ion&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msup><mi>r</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup></math>&nbsp;is formed. How many mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><msup><mi>n</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></math>&nbsp;would be oxidised to&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><msup><mi>n</mi><mn>4</mn></msup></math>&nbsp;by one of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>Cr</mi><mn>2</mn></msub><msubsup><mi mathvariant=\"normal\">O</mi><mn>7</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup></math>&nbsp;ions?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 07:37:58', NULL),
(251499, '85,80,239,915', '<p>What volume of 3 molar&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>H</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;is needed to oxidise 8g of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mi>Fe</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup><mo>&#160;</mo><mi>to</mi><mo>&#160;</mo><msup><mi>Fe</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup></math>?&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>H</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub></math>, gets converted to NO:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 07:39:52', NULL),
(251500, '85,80,239,915', '<p>What mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>H</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;is required to make 1 litre of 2N solution to be used as an oxidising agent in the reaction?</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>3</mn><mi>C</mi><mi>u</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>8</mn><mi>H</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub><mo>&#8594;</mo><mn>3</mn><mi>C</mi><mi>u</mi><msub><mrow><mo>(</mo><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub><mo>)</mo></mrow><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><mi>N</mi><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>4</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 07:41:25', NULL),
(251501, '85,80,239,915', '<p>What is the normality of a&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;solution to be used as an oxidant in acid medium, which contains 15.8g of the compound in 100 mL of solution? Molar mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;is 158:</p>\r\n\r\n<p>&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 07:44:55', NULL),
(251502, '85,80,239,915', '<p>What volume of N&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>K</mi><mn>2</mn></msub><mi>C</mi><msub><mi>r</mi><mn>2</mn></msub><msub><mi>O</mi><mn>7</mn></msub></math>solution is required to oxidise (in acid solution) a solution containing 10g of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><mi>e</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>? (molar mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><mi>e</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>152</mn></math>)</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 07:46:17', NULL),
(251503, '85,80,239,915', '<p>How many millitre of 0.5 N&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><mi>n</mi><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></math>&nbsp;solution will reduce 600 mL of 0.1 N&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>H</mi><mi>g</mi><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub><mo>&#160;</mo><mi>H</mi><msub><mi>g</mi><mn>2</mn></msub><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 07:47:22', NULL),
(251504, '85,80,239,915', '<p>How many miligram of iron&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mrow><mi>F</mi><msup><mi>e</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></mrow></mfenced></math>&nbsp;are equal to 1 mL of 0.1055 N&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>K</mi><mn>2</mn></msub><mi>C</mi><msub><mi>r</mi><mn>2</mn></msub><msub><mi>O</mi><mn>7</mn></msub></math>&nbsp;equivalent?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 07:48:37', NULL),
(251505, '85,80,239,915', '<p>For the reaction,</p>\r\n\r\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>2</mn><mi>F</mi><msup><mi>e</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup><mo>+</mo><mo>&#160;</mo><mi>S</mi><msup><mi>n</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><mi>F</mi><msup><mi>e</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>S</mi><msup><mi>n</mi><mrow><mn>4</mn><mo>+</mo></mrow></msup></math></p>\r\n\r\n<p>The normality of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><mi>n</mi><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></math>&nbsp;(molar mass = 189.7) solution prepared by dissolving 47.5 g in acid solution and diluting with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></math>&nbsp;to a total of 2.25 litre is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 07:50:27', NULL),
(251506, '85,80,239,915', '<p>A 0.518g sample of lime stone is dissolved in HCl and then the calcium is precipitated as&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>a</mi><msub><mi>C</mi><mn>2</mn></msub><msub><mi>O</mi><mn>4</mn></msub></math>. After filtering and washing the precipitate, it requires 40.0 mL of 0.250 N&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>, solution acidified with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;to titrate it as:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>MnO</mi><mn>4</mn><mo>-</mo></msubsup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msup><mi mathvariant=\"normal\">H</mi><mrow><mo>+</mo><mo>&#160;</mo></mrow></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">C</mi><mn>2</mn></msub><msubsup><mi mathvariant=\"normal\">O</mi><mn>4</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>&#160;</mo><mo>&#8594;</mo><msup><mi>Mn</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>CO</mi><mn>2</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi></math></p>\r\n\r\n<p>The percentage of CaO in the sample is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 07:53:18', NULL),
(251507, '85,80,239,915', '<p>What mass of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>H</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;is needed to convert 5g&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>I</mi><mn>2</mn></msub></math>&nbsp;into&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>H</mi><mi>I</mi><msub><mi>O</mi><mn>3</mn></msub><mo>,</mo><mo>&#160;</mo><mi>H</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><mi>N</mi><mi>O</mi></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 07:54:25', NULL),
(251508, '85,80,239,915', '<p>In a reaction 4 mole of electrons are transferred to one mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>H</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;when it acts as an oxidant. The possible reductoin product is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 07:56:33', NULL),
(251509, '85,80,239,915', '<p>0.2g of a sample of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;required 10 mL of N&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;in a titration in the presence of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>. Purity of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 07:58:21', NULL),
(251510, '85,80,239,915', '<p>NaClO solution reacts with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;as,</p>\r\n\r\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><mi>a</mi><mi>C</mi><mi>l</mi><mi>O</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>3</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><mi>N</mi><mi>a</mi><mi>C</mi><mi>l</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;</p>\r\n\r\n<p>A solution of NaCIO used in the above reaction contained 15g of NaCIO per litre. The normality of the solution would be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 07:59:52', NULL),
(251511, '85,80,239,915', '<p>The ratio of amounts of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi></math>&nbsp;needed to precipitate all the metal ions from 100 mL 1M&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>A</mi><mi>g</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;and 100 mL of 1M&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>u</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;is</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:01:04', NULL),
(251512, '85,80,239,915', '<p>5g of a sample of bleaching powder is treated with excess acetic acid and KI solution. The liberated&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>I</mi><mn>2</mn></msub></math>&nbsp;required 50 mL of N/10 hypo. The percentage of available chlorine in the sample is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:02:39', NULL),
(251513, '85,80,239,915', '<p>The number of mole of oxalate ions oxidised by one mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>MnO</mi><mn>4</mn><mo>-</mo></msubsup></math>&nbsp;ion is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:03:23', NULL),
(251514, '85,80,239,915', '<p>What volume of 0.1 M&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;is needed to oxidise 100 mg of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><mi>e</mi><msub><mi>C</mi><mn>2</mn></msub><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;in acidic solution?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:04:25', NULL),
(251515, '85,80,239,915', '<p>In the reduction of dichromate by Fe(II), the number of electrons involved per chromium atom is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:04:57', NULL),
(251516, '85,80,239,915', '<p>A 0.50 M solution fo KI reacts with excess of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>K</mi><mi>I</mi><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;solutions according to the equation.</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mn>6</mn><msup><mi>H</mi><mo>+</mo></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>5</mn><msup><mi>I</mi><mo>-</mo></msup><mo>+</mo><mo>&#160;</mo><mi>I</mi><msubsup><mi>O</mi><mn mathvariant=\"italic\">3</mn><mo mathvariant=\"italic\">-</mo></msubsup><mo>&#8594;</mo><mn>3</mn><msub><mi mathvariant=\"normal\">I</mi><mn>2</mn></msub><mo>+</mo><mn>3</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi></math></p>\r\n\r\n<p>Which of the following statements is true?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:08:09', NULL),
(251517, '85,80,239,915', '<p>Number of moles of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>MnO</mi><mn>4</mn><mo>-</mo></msubsup></math>&nbsp;required to oxidise one mole of ferrous oxalate completely in acidic medium will be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:10:05', NULL),
(251518, '85,80,239,915', '<p>1 mole of chlorine combines with a certain mass of a metal giving 111g of its chloride. The atomic mass of the metal (assuming its valency to be 2) is</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:10:49', NULL),
(251519, '85,80,239,915', '<p>Hydrogen peroxide in aqueous solution decomposes on warning to give oxygen according to the equation,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>a</mi><mi>q</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>(</mo><mi>l</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>O</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math></p>\r\n\r\n<p>under conditions where one mole of gas occupies 24&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>d</mi><msup><mi>m</mi><mn>3</mn></msup></math>, 100&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>c</mi><msup><mi>m</mi><mn>3</mn></msup></math>&nbsp;of XM solution of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;produces 3&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>d</mi><msup><mi>m</mi><mn>3</mn></msup><mo>&#160;</mo><mi>o</mi><mi>f</mi><mo>&#160;</mo><msub><mi>O</mi><mn>2</mn></msub></math>. Thus, X is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:12:45', NULL),
(251520, '85,80,239,915', '<p>A solution of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;is reduced to&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>2</mn></msub></math>. The normality of solution is 0.6. The molarity is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:13:34', NULL),
(251521, '85,80,239,915', '<p>In an experiment 50 mL of 0.1 M solution of a salt reacted with 25 mL of 0.1 M solution of sodium sulphite. The half equation for the oxidation of sulphite ion is:&#39;</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>SO</mi><mn>3</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>(</mo><mi>aq</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>(</mo><mi mathvariant=\"normal\">l</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><msubsup><mi>SO</mi><mn>4</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>(</mo><mi>aq</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msup><mi mathvariant=\"normal\">H</mi><mo>+</mo></msup><mo>(</mo><mi>aq</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msup><mi mathvariant=\"normal\">e</mi><mo>-</mo></msup></math></p>\r\n\r\n<p>If the oxidation number of metal in the salt was 3, what would be the new oxidation number of metal?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:15:57', NULL),
(251522, '85,80,239,915', '<p>8g of sulphur are burnt to form&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;which is oxidised by&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></math>&nbsp;water. The solution is treated with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi><mi>a</mi><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></math>&nbsp;solution. The amount of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi><mi>a</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;precipitated is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:17:18', NULL),
(251523, '85,80,239,915', '<p>0.3g of an oxalate salt was dissolved in 100 mL solution. The solution required 90 mL of N/20&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;for complete oxidation. The % of oxalate ion in salt is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:18:24', NULL),
(251524, '85,80,239,915', '<p>The number of equivalent per mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi></math>&nbsp;used in its oxidation to&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:19:03', NULL),
(251525, '85,80,239,915', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>r</mi><msub><mi>O</mi><mn>5</mn></msub></math>&nbsp;reacts with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub><mo>&#160;</mo><mi>t</mi><mi>o</mi><mo>&#160;</mo><mi>g</mi><mi>i</mi><mi>v</mi><mi>e</mi><mo>&#160;</mo><mi>C</mi><msub><mi>r</mi><mn>2</mn></msub><msub><mrow><mo>(</mo><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub><mo>)</mo></mrow><mn>3</mn></msub><mo>.</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>O</mi><mn>2</mn></msub></math>. Moles of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;liberated by 1 mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>r</mi><msub><mi>O</mi><mn>5</mn></msub></math>&nbsp;in this reaction are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:20:26', NULL),
(251526, '85,80,239,915', '<p>2 mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><mi>e</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;are oxidised by &#39;X&#39; mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;whereas 2 mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><mi>e</mi><msub><mi>C</mi><mn>2</mn></msub><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;are oxidised by &#39;Y&#39; mole of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>. The ratio of &#39;X&#39; and &#39;Y&#39; is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:22:00', NULL),
(251527, '85,80,239,256', '<p>The ionic radii of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>N</mi><mrow><mn>3</mn><mo>-</mo></mrow></msup><mo>,</mo><mo>&#160;</mo><msup><mi>O</mi><mrow><mn>2</mn><mo>-</mo></mrow></msup></math>&nbsp;and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>F</mi><mo>-</mo></msup></math>&nbsp;are respectively given by:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:24:45', NULL),
(251528, '85,80,239,256', '<p>Which of the following sequence regarding ionisation potential of coinage metal is correct?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:25:47', NULL),
(251529, '85,80,239,256', '<p>The elctronegativity order of O, F, CI and Br is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:27:27', NULL),
(251530, '85,80,239,256', '<p>Atomic radii of fluorine and neon in angstrom unit are respectively given by:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:28:19', NULL),
(251531, '85,80,239,256', '<p>Ionisation potential values of &#39;d&#39; block elements as compared to ionisation values of &#39;f&#39; block elements are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:29:03', NULL),
(251532, '85,80,239,256', '<p>The isoelectronic species among the following are:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mi mathvariant=\"normal\">I</mi><mo>-</mo><msubsup><mi>CH</mi><mn>3</mn><mo>+</mo></msubsup><mo>;</mo><mo>&#160;</mo><mi>II</mi><mo>-</mo><msubsup><mi>NH</mi><mn>2</mn><mo>+</mo></msubsup><mo>;</mo><mo>&#160;</mo><mi>III</mi><mo>-</mo><msubsup><mi>NH</mi><mn>4</mn><mo>+</mo></msubsup><mo>;</mo><mo>&#160;</mo><mi>IV</mi><mo>-</mo><msub><mi>NH</mi><mn>3</mn></msub></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:30:22', NULL),
(251533, '85,80,239,256', '<p>Which has the lowest anion to cation size ratio?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:30:51', NULL),
(251534, '85,80,239,256', '<p>The&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>I</mi><msub><mi>P</mi><mn>1</mn></msub><mo>,</mo><mi>I</mi><msub><mi>P</mi><mn>2</mn></msub><mo>,</mo><mi>I</mi><msub><mi>P</mi><mn>3</mn></msub><mo>,</mo><mi>I</mi><msub><mi>P</mi><mn>4</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>I</mi><msub><mi>P</mi><mn>5</mn></msub></math>&nbsp;of an element are 7.1, 14.3, 34.5, 46.8, 162.2 eV respectively. The element is likely to be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:32:07', NULL),
(251535, '85,80,239,256', '<p>Covalent radius of Li is 123 pm. The crystal radius of Li will be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:33:03', NULL),
(251536, '85,80,239,256', '<p>The correct order of increasing electropositive character among Cu, Fe and Mg is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:34:02', NULL),
(251537, '85,80,239,256', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>I</mi><msub><mi>P</mi><mn>1</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>I</mi><msub><mi>P</mi><mn>2</mn></msub></math>&nbsp;of Mg are 178 and 348 kcal&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. The energy required for the reaction,</p>\r\n\r\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mi>Mg</mi><mo>&#160;</mo><mo>&#8594;</mo><mo>&#160;</mo><msup><mi>Mg</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><msup><mi mathvariant=\"normal\">e</mi><mo>-</mo></msup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:36:08', NULL),
(251538, '85,80,239,256', '<p>In which element shielding effect is not possible?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:36:35', NULL),
(251539, '85,80,239,256', '<p>The energy change accompanying the process given below is:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msup><mi>a</mi><mo>+</mo></msup><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>C</mi><msup><mi>l</mi><mo>-</mo></msup><mo>(</mo><mi>g</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mi>N</mi><mi>a</mi><mi>C</mi><mi>l</mi><mo>(</mo><mi>s</mi><mo>)</mo></math>:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:37:39', NULL),
(251540, '85,80,239,256', '<p>Which among the following elements has lowest value of ionisation energy?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:38:14', NULL),
(251541, '85,80,239,256', '<p>Which of the following element has higher ionisation energy?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:40:07', NULL),
(251542, '85,80,239,256', '<p>In which of the following process energy is liberated?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:41:44', NULL),
(251543, '85,80,239,256', '<p>The correct electronegativity order is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:44:19', NULL),
(251544, '85,80,239,256', '<p>The screening effect of d-electrons is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:46:04', NULL),
(251545, '85,80,239,256', '<p>The hydration energy of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>M</mi><msup><mi>g</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></math>&nbsp;is larger than that of :</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:47:09', NULL),
(251546, '85,80,239,256', '<p>Ionization potential of Na would be numerically the same as:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:48:33', NULL),
(251547, '85,80,239,256', '<p>Which of the following statements is most correct? Effective nuclear charge of an atom depends on:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:49:40', NULL),
(251548, '85,80,239,256', '<p>For the formation of covalent bond, the difference in the value of electronegativities should be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:50:20', NULL),
(251549, '85,80,239,256', '<p>Ionization energy of nitrogen is more than oxygen because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:51:10', NULL),
(251550, '85,80,239,256', '<p>The correct order of second ionisation potential of carbon, nitrogen, oxygen and fluorine is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:52:06', NULL),
(251551, '85,80,239,256', '<p>Which property of halogens increases from F to I?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:52:52', NULL),
(251552, '85,80,239,256', '<p>Which has the minimum bond energy?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:53:20', NULL),
(251553, '85,80,239,256', '<p>Which statement is wrong?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:54:18', NULL),
(251554, '85,80,239,256', '<p>The order of first electron affinity of O, S and Se is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:54:56', NULL),
(251555, '85,80,239,256', '<p>The correct order of decreasing first ionisation potential is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:55:50', NULL),
(251556, '85,80,239,256', '<p>Among O, C, F, Cl, Br the correct order of increasing atomic radii is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:56:58', NULL),
(251557, '85,80,239,256', '<p>Which group of atoms has nearly same atomic radius?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:57:43', NULL),
(251558, '85,80,239,256', '<p>The ionization potential order for which set is correct?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:58:29', NULL),
(251559, '85,80,239,256', '<p>Which of the following does not reflect the periodicity of elements?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 08:59:12', NULL);
INSERT INTO `questions` (`id`, `category_id`, `question`, `question_type`, `answer_type`, `subjective_ans`, `marks`, `time`, `added_by`, `status`, `current_url`, `created_at`, `updated_at`) VALUES
(251560, '85,80,239,915', '<p>Carbon reacts with oxygen to form two oxides, CO and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></math>. This is because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doupdate', '2025-08-22 10:31:35', NULL),
(251561, '85,80,239,915', '<p>In the reaction between acidified&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>K</mi><mn>2</mn></msub><mi>C</mi><msub><mi>r</mi><mn>2</mn></msub><msub><mi>O</mi><mn>7</mn></msub></math>&nbsp;and iron (II) ions shown by the equation:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>Cr</mi><mn>2</mn></msub><msubsup><mi mathvariant=\"normal\">O</mi><mn>7</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>(</mo><mi>aq</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>6</mn><msup><mi>Fe</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup><mo>(</mo><mi>aq</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>14</mn><msup><mi mathvariant=\"normal\">H</mi><mo>+</mo></msup><mo>(</mo><mi>aq</mi><mo>)</mo><mo>&#160;</mo><mo>&#8594;</mo><mn>2</mn><msup><mi>Cr</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup><mo>(</mo><mi>aq</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>7</mn><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi><mo>(</mo><mi mathvariant=\"normal\">l</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>6</mn><msup><mi>Fe</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup><mo>(</mo><mi>aq</mi><mo>)</mo></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:35:02', NULL),
(251562, '85,80,239,915', '<p>If&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi></math>&nbsp;is passed through an acidified&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>K</mi><mn>2</mn></msub><mi>C</mi><msub><mi>r</mi><mn>2</mn></msub><msub><mi>O</mi><mn>7</mn></msub></math>&nbsp;solution, the colour of the solution:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:36:06', NULL),
(251563, '85,80,239,915', '<p>A student states that heating of limestone is an oxidation process, the reason he gives than an oxide of the metal is produced on heating. Which one is correct?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:37:19', NULL),
(251564, '85,80,239,915', '<p>What would happen when a small quantity of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;is added to a solution of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><mi>e</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:38:33', NULL),
(251565, '85,80,239,915', '<p>Fluorine exhibits only -1 oxidation state, while iodine exhibits oxidation states of -1, +1, +3, +5 and +7. This is due to :</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:39:48', NULL),
(251566, '85,80,239,915', '<p>In the aluminothermic process, aluminium acts as:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:40:18', NULL),
(251567, '85,80,239,915', '<p>Saline hydrides are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:40:59', NULL),
(251568, '85,80,239,915', '<p>The oxoacid which acts both as oxidising and reducing agent is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:41:54', NULL),
(251569, '85,80,239,915', '<p>Which is not correct in case of Mohr&#39;s salt?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:42:45', NULL),
(251570, '85,80,239,915', '<p>Respiration is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:43:06', NULL),
(251571, '85,80,239,915', '<p>HBr and HI reduce&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub><mo>,</mo><mo>&#160;</mo><mi>H</mi><mi>C</mi><mi>l</mi></math>&nbsp;can reduce&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;and HF can reduce:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:44:17', NULL),
(251572, '85,80,239,915', '<p>One gas bleaches the colour of the flowers by reduction while the other by oxidation. The gases are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:45:28', NULL),
(251573, '85,80,239,915', '<p>Ozone tails mercury. The reaction is.....of Hg.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:45:57', NULL),
(251574, '85,80,239,915', '<p>Which is strongest oxidising agent?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:46:36', NULL),
(251575, '85,80,239,915', '<p>Stannous chloride gives a white precipitate with a solution of mercuric chloride. In this process mercuric chloride is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:47:34', NULL),
(251576, '85,80,239,915', '<p>In presence of moisture&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;can&quot;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:48:21', NULL),
(251577, '85,80,239,915', '<p>Starch iodide paper is used to test for the presence of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:48:55', NULL),
(251578, '85,80,239,915', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;act as.........indicator in its redox titrations.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-22 10:49:33', NULL),
(251579, '85,80,239,915', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>K</mi><mn>3</mn></msub><mi>F</mi><mi>e</mi><msub><mrow><mo>(</mo><mi>C</mi><mi>N</mi><mo>)</mo></mrow><mn>6</mn></msub></math>&nbsp;is used as.......indicator for&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><mi>e</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;vs.&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>K</mi><mn>2</mn></msub><mi>C</mi><msub><mi>r</mi><mn>2</mn></msub><msub><mi>O</mi><mn>7</mn></msub></math>&nbsp;titrations.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 01:54:10', NULL),
(251580, '85,80,239,915', '<p>Turn bull&#39;s blue is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 01:56:08', NULL),
(251581, '85,80,239,915', '<p>Corrosion of iron is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 01:56:45', NULL),
(251582, '85,80,239,915', '<p>Durinig the presence of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>SO</mi><mn>3</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup><mo>&#160;</mo><mi>and</mi><mo>&#160;</mo><msup><mi mathvariant=\"normal\">S</mi><mrow><mn>2</mn><mo>-</mo></mrow></msup></math>&nbsp;in a mixture, addition of dil.&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>, one notice that:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 01:59:00', NULL),
(251583, '85,80,239,915', '<p>Which one of the compound does not decolourised an acidified solution of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>K</mi><mi>M</mi><mi>n</mi><msub><mi>O</mi><mn>4</mn></msub></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:00:33', NULL),
(251584, '85,80,239,915', '<p>A compound of Xe and F is found to have 53.3% Xe. Oxidation number of Xe in this compound is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:01:23', NULL),
(251585, '85,80,239,915', '<p>The number of electrons lost or gained during the change,</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><mi>e</mi><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>&#160;</mo><mo>&#8594;</mo><mi>F</mi><msub><mi>e</mi><mn>3</mn></msub><msub><mi>O</mi><mn>4</mn></msub><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub></math>, is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:02:21', NULL),
(251586, '85,80,239,915', '<p>Bleaching action of chlorine in presence of moisture is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:02:58', NULL),
(251587, '85,80,239,915', '<p>13.5 g aluminium changes to&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>A</mi><msup><mi>l</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup></math>in solution by loosing:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:04:32', NULL),
(251588, '85,80,239,915', '<p>In an oxidation process for a cell&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi mathvariant=\"normal\">M</mi><mn>1</mn></msub><mo>&#160;</mo><mo>&#8594;</mo><msubsup><mi mathvariant=\"normal\">M</mi><mn>1</mn><mrow><mi mathvariant=\"normal\">n</mi><mo>+</mo></mrow></msubsup><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mi>ne</mi></math>, the other metal&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><msub><mi>M</mi><mn>2</mn></msub></mfenced></math>&nbsp;being univalent showing reduction takes up the........electrons to complete redox reaction.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:06:06', NULL),
(251589, '85,80,239,915', '<p>Total number of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>A</mi><mi>l</mi><msub><mi>F</mi><mn>3</mn></msub></math>&nbsp;molecules in a sample of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>A</mi><mi>l</mi><msub><mi>F</mi><mn>3</mn></msub></math>&nbsp;containing&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>3</mn><mo>.</mo><mn>01</mn><mo>&#160;</mo><mo>&#215;</mo><mo>&#160;</mo><msup><mn>10</mn><mn>23</mn></msup></math>&nbsp;ions of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>F</mi><mo>-</mo></msup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:08:09', NULL),
(251590, '85,80,239,256', '<p>The order of screening effect of electrons of s, p, d and f - orbitals of a given shell of an atom on its outer shell electrons is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:13:57', NULL),
(251591, '85,80,239,256', '<p>The first ionisation enthalpies of Na, Mg, Al and Si are in the order:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:15:18', NULL),
(251592, '85,80,239,256', '<p>Which of the following is the correct order of sixe of the given species?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:16:56', NULL),
(251593, '85,80,239,256', '<p>Maximum number of covalent bonds between two like atoms can be</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:17:28', NULL),
(251594, '85,80,239,256', '<p>Octet rule is not valid for the molecule:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:18:16', NULL),
(251595, '85,80,239,256', '<p>Which has a giant covalent structure?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:19:08', NULL),
(251596, '85,80,239,256', '<p>The unequal sharing of bonded pair of electrons between two atoms in a molecule gives rise to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:19:56', NULL),
(251597, '85,80,239,256', '<p>The species showing&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>p</mi><mi mathvariant=\"normal\">&#960;</mi><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mi>d&#960;</mi></math>&nbsp;overlapping is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:21:10', NULL),
(251598, '85,80,239,256', '<p>The bonds present in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>N</mi><mn>2</mn></msub><msub><mi>O</mi><mn>5</mn></msub></math>&nbsp;are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:21:51', NULL),
(251599, '85,80,239,256', '<p>Which statement is true?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:23:25', NULL),
(251600, '85,80,239,256', '<p>A molecule which cannot exist theoretically is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:24:27', NULL),
(251601, '85,80,239,256', '<p>The solubility of KCI is relatively more in (where D is dielectric constant):</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:26:22', NULL),
(251602, '85,80,239,256', '<p>Which ion has a higher polarizing power?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:27:21', NULL),
(251603, '85,80,239,256', '<p>Which one is most polar?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:28:36', NULL),
(251604, '85,80,239,256', '<p>In which molecule the van der Waal&#39;s force is likely to be the most important in determining the m.p. and b.p.?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:29:52', NULL),
(251605, '85,80,239,256', '<p>The intermolecular distance in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub></math>&nbsp;and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></math>&nbsp;molecules are 74 and 198 pm respectively. The bond length of H-Cl may be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:35:09', NULL),
(251606, '85,80,239,256', '<p>Supar octet molecule is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:36:06', NULL),
(251607, '85,80,239,256', '<p>The lowest bond energy exist in the following bonds for:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:37:02', NULL),
(251608, '85,80,239,256', '<p>The angle between covalent bonds is maximum in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:38:07', NULL),
(251609, '85,80,239,256', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>P</mi><msub><mi>F</mi><mn>3</mn></msub></math>&nbsp;molecule is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:39:26', NULL),
(251610, '85,80,239,256', '<p>The nautre of bonding in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>C</mi><msub><mi>l</mi><mn>4</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>C</mi><mi>a</mi><msub><mi>H</mi><mn>2</mn></msub></math>:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:41:29', NULL),
(251611, '85,80,239,256', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub></math>&nbsp;has a net dipole moment, but boron trifluoride&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mrow><mi>B</mi><msub><mi>F</mi><mn>3</mn></msub></mrow></mfenced></math>&nbsp;has zero dipole moment, because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:44:00', NULL),
(251612, '85,80,239,256', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>C</mi><msub><mi>l</mi><mn>4</mn></msub></math>&nbsp;is insoluble in water because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:47:47', NULL),
(251613, '85,80,239,256', '<p>If&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msup><mi>a</mi><mo>+</mo></msup></math>&nbsp;ion is larger than&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>M</mi><msup><mi>g</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup><mo>&#160;</mo><mi>i</mi><mi>o</mi><mi>n</mi><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msup><mi>S</mi><mrow><mn>2</mn><mo>-</mo></mrow></msup></math>&nbsp;ion is larger than&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msup><mi>l</mi><mo>-</mo></msup></math>&nbsp;ion, which of the following will be least soluble in water?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:50:06', NULL),
(251614, '85,80,239,256', '<p>The bond between two identical non-metal atoms has a pair of electrons:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:51:43', NULL),
(251615, '85,80,239,256', '<p>HCl molecule in the vapour state is an example of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:52:33', NULL),
(251616, '85,80,239,256', '<p>Which of the following are not correct?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:54:30', NULL),
(251617, '85,80,239,256', '<p>Which of the following statement is correct?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 02:56:24', NULL),
(251618, '85,80,239,256', '<p>The correct order of decreasing polarity is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:20:38', NULL),
(251619, '85,80,239,256', '<p>Border Haber cycle is used to determine:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:21:11', NULL),
(251620, '85,80,239,256', '<p>The covalency of nitrogen in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>H</mi><mi>N</mi><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:21:44', NULL),
(251621, '85,80,239,256', '<p>The ICl molecule is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:22:30', NULL),
(251622, '85,80,239,256', '<p>Which of the following is least ionic?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:23:39', NULL),
(251623, '85,80,239,256', '<p>Which shows non-directional bonding?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:24:32', NULL),
(251624, '85,80,239,256', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>F</mi><mn>3</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:25:47', NULL),
(251625, '85,80,239,256', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub></math>&nbsp;has higher boiling point than expected, because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:27:33', NULL),
(251626, '85,80,239,256', '<p>Proton plays an important role in....bonding</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:28:22', NULL),
(251627, '85,80,239,256', '<p>In the electronic structure of acetic acid there are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:29:42', NULL),
(251628, '85,80,239,256', '<p>Molecular size of ICI and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi><msub><mi>r</mi><mn>2</mn></msub></math>&nbsp; is nearly same, but boiling point of ICI is about&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>40</mn><mo>&#176;</mo></msup><mi mathvariant=\"normal\">C</mi></math>&nbsp;higher than&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi><msub><mi>r</mi><mn>2</mn></msub></math>. This might be due to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:32:16', NULL),
(251629, '85,80,239,256', '<p>Among NaF, NaCl, NaBr, NaI, the NaF has highest melting point because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:33:41', NULL),
(251630, '85,80,239,256', '<p>Which involves breaking of covalent bond?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:35:40', NULL),
(251631, '85,80,239,256', '<p>When ionic compounds get dissolved in water:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:36:36', NULL),
(251632, '85,80,239,256', '<p>The dipole moment of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>H</mi><mi>C</mi><msub><mi>l</mi><mn>3</mn></msub></math>&nbsp;is 1.05 debye while that of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>C</mi><msub><mi>l</mi><mn>4</mn></msub></math>&nbsp; is zero, because&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>C</mi><msub><mi>l</mi><mn>4</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:37:53', NULL),
(251633, '85,80,239,256', '<p>The bond between chlorine and bromine in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi><mi>r</mi><mi>C</mi><msub><mi>l</mi><mn>3</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:39:03', NULL),
(251634, '85,80,239,256', '<p>The electrons used in bonding atoms:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:40:10', NULL),
(251635, '85,80,239,256', '<p>The&nbsp; cyanide ion,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msup><mi>N</mi><mo>-</mo></msup><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>N</mi><mn>2</mn></msub></math>&nbsp;are isoelectronic. But to&nbsp; in contrast to&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msup><mi>N</mi><mo>-</mo></msup><mo>,</mo><mo>&#160;</mo><msub><mi>N</mi><mn>2</mn></msub></math>&nbsp;is chemically inert, because of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:42:52', NULL),
(251636, '85,80,239,256', '<p>In dry ice there are.......in between molecules.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:43:28', NULL),
(251637, '85,80,239,256', '<p>Most covalent halide of aluminium is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:44:39', NULL),
(251638, '85,80,239,256', '<p>At ordinary temperature and pressure, among halogens, the chlorine is a gas, bromine is a liquid and iodine is a solid. This is because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:47:45', NULL),
(251639, '85,80,239,256', '<p>A number of ionic compounds, e.g., AgCl,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>a</mi><msub><mi>F</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><mi>B</mi><mi>a</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;are insoluble, in water. This is because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:49:31', NULL),
(251640, '85,80,239,256', '<p>Solid&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub></math>&nbsp;is</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:50:06', NULL),
(251641, '85,80,239,256', '<p>Which does not show inert pair effect?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:50:31', NULL),
(251642, '85,80,239,256', '<p>The covalent compound HCl has the polar character because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:51:49', NULL),
(251643, '85,80,239,256', '<p>Which has higher bond energy and stronger bond?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:52:49', NULL),
(251644, '85,80,239,256', '<p>The lattice energy order for lithium halide is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:54:08', NULL),
(251645, '85,80,239,256', '<p>The compound showing maximum covalent character is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:55:23', NULL),
(251646, '85,80,239,256', '<p>The compound showing maximum covalent character:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:56:33', NULL),
(251647, '85,80,239,256', '<p>Which is soluble in water?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:57:08', NULL),
(251648, '85,80,239,256', '<p>Which one is electron deficient compound?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:58:07', NULL),
(251649, '85,80,239,256', '<p>The compound with the maximum dipole moment among the following is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 13:58:57', NULL),
(251650, '85,80,239,256', '<p>Amongst LiCl, RbCl,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi><mi>e</mi><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>M</mi><mi>g</mi><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></math>, the compounds with the greatest and the least ionic character respectively are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 14:01:22', NULL),
(251651, '85,80,239,256,261,3159', '<p>A&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi><msup><mi>p</mi><mn>3</mn></msup></math>&nbsp;- hybrid orbital contains:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 14:02:50', NULL),
(251652, '85,80,239,256,261,3159', '<p>The orbitals of same energy level providing the most efficient overlapping are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 14:04:08', NULL),
(251653, '85,80,239,256,261,3159', '<p>In&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>O</mi><msub><mi>F</mi><mn>2</mn></msub></math>, number of bond pairs and lone pairs of electrons are respectively:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 14:04:53', NULL),
(251654, '85,80,239,256,261,3159', '<p>Which statement is correct?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 14:06:27', NULL),
(251655, '85,80,239,256,261,3159', '<p>Compound formed by&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi><msup><mi>p</mi><mn>3</mn></msup></math>&nbsp;d-hybridization will have structure:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 14:07:43', NULL),
(251656, '85,80,239,256,261,3159', '<p>If a molecule&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>M</mi><msub><mi>X</mi><mn>3</mn></msub></math>&nbsp;has zero diple moment the sigma bonding orbitals used by M (at. no. &lt; 21) is</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 14:09:04', NULL),
(251657, '85,80,239,256,261,3159', '<p>The shape of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>ClO</mi><mn>4</mn><mo>-</mo></msubsup></math>&nbsp;ion is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 14:09:51', NULL),
(251658, '85,80,239,256,261,3159', '<p>In which molecule the central atom does not use&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi><msup><mi>p</mi><mn>3</mn></msup></math>-hybrid orbitals in its bonding?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 14:11:37', NULL),
(251659, '85,80,239,256,261,3159', '<p>Increasing order (lower first) of size of the various hybridised orbitals is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 14:13:21', NULL),
(251660, '85,80,239,256,261,3159', '<p>Which of the following statements regarding carbon monoxide is correct?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 14:14:32', NULL),
(251661, '85,80,239,256,261,3159', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;has the same geometry as:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo>(</mo><mi>A</mi><mo>)</mo><mo>&#160;</mo><mi>H</mi><mi>g</mi><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><mo>(</mo><mi>B</mi><mo>)</mo><mo>&#160;</mo><mi>N</mi><msub><mi>O</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><mo>(</mo><mi>C</mi><mo>)</mo><mo>&#160;</mo><mi>S</mi><mi>n</mi><mi>C</mi><msub><mi>l</mi><mn>4</mn></msub><mo>,</mo><mo>&#160;</mo><mo>(</mo><mi>D</mi><mo>)</mo><mo>&#160;</mo><msub><mi>C</mi><mn>2</mn></msub><msub><mi>H</mi><mn>2</mn></msub></math></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 14:15:52', NULL),
(251662, '85,80,239,256,261,3159', '<p>Which of the following is false?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-23 14:17:11', NULL),
(251663, '85,80,239,256,261,3159', '<p>Two lone pairs of electrons and two bond pairs are present in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 02:36:59', NULL),
(251664, '85,80,239,256,261,3159', '<p>The bond angle in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><mo>&#160;</mo></math>(for H-S-H) is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 02:38:56', NULL),
(251665, '85,80,239,256,261,3159', '<p>In&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>P</mi><mi>C</mi><msub><mi>l</mi><mn>5</mn></msub></math>&nbsp;molecule, P is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 02:41:14', NULL),
(251666, '85,80,239,256,261,3159', '<p>Structure of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>ICI</mi><mn>2</mn><mo>-</mo></msubsup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 02:42:43', NULL),
(251667, '85,80,239,256,261,3159', '<p>The hybridization of carbon in diamon, graphite and acetylene is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 02:45:01', NULL),
(251668, '85,80,239,256,261,3159', '<p>Bonded electron pairs present in octahedral&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><msub><mi>F</mi><mn>6</mn></msub></math>&nbsp;molecule :</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 02:45:42', NULL),
(251669, '85,80,239,256,261,3159', '<p>Formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi mathvariant=\"normal\">&#960;</mi></math>-bond :</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 02:46:38', NULL),
(251670, '85,80,239,256,261,3159', '<p>The compound in which carbon atoms uses only its&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi><msup><mi>p</mi><mn>3</mn></msup></math>-hybrid orbitals for bond formation is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 02:48:04', NULL),
(251671, '85,80,239,256,261,3159', '<p>The Cl-C-Cl angle in 1, 1, 2, 2-tetrachloroethene and tetrachloromethane respectively will be about:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 02:50:22', NULL),
(251672, '85,80,239,256,261,3159', '<p>The bond angle and hybridization in ether&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mrow><mi>C</mi><msub><mi>H</mi><mn>3</mn></msub><mi>O</mi><mi>C</mi><msub><mi>H</mi><mn>3</mn></msub></mrow></mfenced></math>&nbsp;is&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 02:51:56', NULL),
(251673, '85,80,239,256,261,3159', '<p>The double bonds between the two carbon atoms in ethylene consists of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 02:53:14', NULL),
(251674, '85,80,239,256,261,3159', '<p>How many&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mi mathvariant=\"normal\">&#963;</mi><mo>-</mo><mi>and</mi><mo>-</mo><mi mathvariant=\"normal\">&#960;</mi></math>&nbsp;bonds are there in the molecule of tetracyanoethylene?</p>\r\n\r\n<p><img alt=\"\" src=\"https://school.achievam.com/upload/questionbank/question/que_1756004088.PNG\" style=\"height:64px; width:238px\" /></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 02:56:29', NULL),
(251675, '85,80,239,256,261,3159', '<p>The bond between carbon atom (1) and carbon atom (2) in compound</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mi mathvariant=\"normal\">N</mi><mo>&#8801;</mo><mi mathvariant=\"normal\">C</mi><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mi>CH</mi><mo>&#160;</mo><mo>=</mo><msub><mi>CH</mi><mn>2</mn></msub><mspace linebreak=\"newline\"/><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>(</mo><mn>1</mn><mo>)</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>(</mo><mn>2</mn><mo>)</mo></math>, involves the hybrid orbitals:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 02:59:02', NULL),
(251676, '85,80,239,256,261,3159', '<p>Oxygen is divalent, but sulphur exhibits variable valency of 2, 4 and 6, because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:01:53', NULL),
(251677, '85,80,239,256,261,3159', '<p>Which bond angle results in the minimum dipole moment for the triatomic molecule,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>X</mi><msub><mi>Y</mi><mn>2</mn></msub></math>&nbsp;shows below?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:03:25', NULL),
(251678, '85,80,239,256,261,3159', '<p>The hybridization of phosphorus in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>P</mi><mi>O</mi><mi>C</mi><msub><mi>l</mi><mn>3</mn></msub></math>&nbsp;is same as in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:04:48', NULL),
(251679, '85,80,239,256,261,3159', '<p>Hybridization state of I in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>ICI</mi><mn>2</mn><mo>+</mo></msubsup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:06:30', NULL),
(251680, '85,80,239,256,261,3159', '<p>Which does not use&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi><msup><mi>p</mi><mn>3</mn></msup></math>&nbsp;- hybrid orbitals in its bonding?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:07:52', NULL),
(251681, '85,80,239,256,261,3159', '<p>Which of the following molecules is covalent and shows expanded octet in its formation?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:08:54', NULL),
(251682, '85,80,239,256,261,3159', '<p>Which does not have pyramidal geometry?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:10:02', NULL),
(251683, '85,80,239,256,261,3159', '<p>Which species has lone pair on central atom?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:11:03', NULL),
(251684, '85,80,239,256,261,3159', '<p>The number of sigma and pi-bonds in 1-butene-3-yne are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:11:58', NULL),
(251685, '85,80,239,256,261,3159', '<p>As the s-character of hybridization orbitals increases, the bond angle:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:12:36', NULL),
(251686, '85,80,239,256,261,3159', '<p>Maximum covalence of an atom of an element is equal to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:14:03', NULL),
(251687, '85,80,239,256,261,3159', '<p>The type of hybridization of sulphur atom present in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><msub><mi>O</mi><mn>3</mn></msub></math>&nbsp;is respectively:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:15:37', NULL),
(251688, '85,80,239,256,261,3159', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>P</mi><mi>C</mi><msub><mi>l</mi><mn>5</mn></msub></math>&nbsp;exists but&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><mi>C</mi><msub><mi>l</mi><mn>5</mn></msub></math>&nbsp;does not because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:16:44', NULL),
(251689, '85,80,239,256,261,3159', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>X</mi><mi>e</mi><msub><mi>F</mi><mn>6</mn></msub></math>&nbsp;is :</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doupdate', '2025-08-24 03:17:00', NULL),
(251690, '85,80,239,256,261,3159', '<p>Which molecule is T-shaped?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:18:51', NULL),
(251691, '85,80,239,256,261,3159', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></math>&nbsp;has a net dipole moment, while&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi><mi>e</mi><msub><mi>F</mi><mn>2</mn></msub></math>&nbsp;has zero diple moment, because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:20:35', NULL),
(251692, '85,80,239,256,261,3159', '<p>Bond angle between two hybrid orbitals is&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>105</mn><mo>&#176;</mo></msup></math>. Hybrid character orbital is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:21:42', NULL),
(251693, '85,80,239,256,261,3159', '<p>Which is not characteristic of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi mathvariant=\"normal\">&#960;</mi></math>-bond?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:23:26', NULL),
(251694, '85,80,239,256,261,3159', '<p>The shape of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>NO</mi><mn>3</mn><mo>-</mo></msubsup></math>&nbsp;is planar. It is formed by the overlapping of oxygen orbitals with........orbitals of nitrogen.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:24:50', NULL),
(251695, '85,80,239,256,261,3159', '<p>The hybridization of P in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>PO</mi><mn>4</mn><mrow><mn>3</mn><mo>-</mo></mrow></msubsup></math>&nbsp;is same as in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:26:56', NULL),
(251696, '85,80,239,256,261,3159', '<p>How many bonded electron pairs are present in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>I</mi><msub><mi>F</mi><mn>7</mn></msub></math>&nbsp;molecule?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:27:48', NULL),
(251697, '85,80,239,256,261,3159', '<p>The pair having similar geometry is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:31:18', NULL),
(251698, '85,80,239,256,261,3159', '<p>The number of lone pairs is same in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>P</mi><mi>C</mi><msub><mi>l</mi><mn>3</mn></msub></math>&nbsp;and:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:33:21', NULL),
(251699, '85,80,239,256,261,3159', '<p>The structure of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>X</mi><mi>e</mi><msub><mi>F</mi><mn>4</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:33:59', NULL),
(251700, '85,80,239,256,261,3159', '<p>The species having octahedral shape is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 03:35:00', NULL),
(251701, '85,80,239,256,261,3159', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>O</mi><msub><mi>F</mi><mn>2</mn></msub></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doupdate', '2025-08-24 03:36:04', NULL),
(251702, '85,80,239,256,261,3159', '<p>The bond strength increases:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:10:34', NULL),
(251703, '85,80,239,256,261,3159', '<p>The hybridization of carbon in diamond, graphite and acetylene is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:12:00', NULL),
(251704, '85,80,239,256,261,3159', '<p>The bond angle between H-O-H in ice is closest to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:13:35', NULL),
(251705, '85,80,239,256,261,3159', '<p>The structure of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>ICl</mi><mn>2</mn><mo>-</mo></msubsup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:14:39', NULL),
(251706, '85,80,239,256,261,3159', '<p>In piperidine&nbsp;<img alt=\"\" src=\"https://school.achievam.com/upload/questionbank/question/que_1756048534.PNG\" style=\"height:45px; width:95px\" />&nbsp;atoms has hybridization:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:16:26', NULL),
(251707, '85,80,239,256,261,3159', '<p>Total number of lone pair of electrons in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi mathvariant=\"normal\">I</mi><mn>3</mn><mo>-</mo></msubsup></math>&nbsp;ion is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:17:15', NULL),
(251708, '85,80,239,256,263', '<p>Which cannot exist on the basis of M.O. theory?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:41:34', NULL),
(251709, '85,80,239,256,263', '<p>Which of the following has fractional bond order?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:42:43', NULL),
(251710, '85,80,239,256,263', '<p>The number of antibonding electrons pairs in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi mathvariant=\"normal\">O</mi><mn>2</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup></math>&nbsp;on the basis of MO theory are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:43:27', NULL),
(251711, '85,80,239,256,263', '<p>The bond order of CO molecule on the basis of molecular orbital theory is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:44:15', NULL),
(251712, '85,80,239,256,263', '<p>The value of bond order in nitrogen and oxygen molecule is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:44:46', NULL),
(251713, '85,80,239,256,263', '<p>In the formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi mathvariant=\"normal\">N</mi><mn>2</mn><mo>+</mo></msubsup><mi>from</mi><mo>&#160;</mo><msub><mi mathvariant=\"normal\">N</mi><mn>2</mn></msub></math>, the electron is lost from:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:46:44', NULL),
(251714, '85,80,239,256,263', '<p>The bond order of individual carbon-carbon bonds in benzene is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:47:33', NULL),
(251715, '85,80,239,256,263', '<p>The incorrect statements regarding bonding molecular orbitals because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:49:22', NULL),
(251716, '85,80,239,256,263', '<p>The bond order in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi mathvariant=\"normal\">O</mi><mn>2</mn><mo>+</mo></msubsup></math>&nbsp;is equal to bond order in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:50:37', NULL),
(251717, '85,80,239,256,263', '<p>The energy of antibonding molecular orbitals is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:51:31', NULL),
(251718, '85,80,239,256,263', '<p>Which one species has the longest bond length?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:53:13', NULL);
INSERT INTO `questions` (`id`, `category_id`, `question`, `question_type`, `answer_type`, `subjective_ans`, `marks`, `time`, `added_by`, `status`, `current_url`, `created_at`, `updated_at`) VALUES
(251719, '85,80,239,256,263', '<p>What bond order does&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>L</mi><msub><mi>i</mi><mn>2</mn></msub></math>&nbsp;have ?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:53:53', NULL),
(251720, '85,80,239,256,263', '<p>Concept of bond order in the molecular orbital theory depends on the number of electrons in the bonding and antibonding orbitals. The bond order.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:56:13', NULL),
(251721, '85,80,239,256,263', '<p>The bond order of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi mathvariant=\"normal\">C</mi><mn>2</mn><mo>+</mo></msubsup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:57:16', NULL),
(251722, '85,80,239,256,263', '<p>The bond order of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi mathvariant=\"normal\">C</mi><mn>2</mn><mo>+</mo></msubsup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:58:22', NULL),
(251723, '85,80,239,256,263', '<p>The bond order is maximum in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 15:59:43', NULL),
(251724, '85,80,239,256,263', '<p>Which of the following has maximum bond energy?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:00:56', NULL),
(251725, '85,80,239,256,263', '<p>Which is present in peroxides?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:01:54', NULL),
(251726, '85,80,239,256,263', '<p>The diamagnetic molecules are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:03:19', NULL),
(251727, '85,80,239,256,263', '<p>The energy of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mi mathvariant=\"normal\">&#963;</mi></math>&nbsp;2s-orbital is greater than&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>&#963;</mi><mo>*</mo></math>&nbsp;Is orbital because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:05:37', NULL),
(251728, '85,80,239,256,263', '<p>In&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi mathvariant=\"normal\">H</mi><mn>2</mn><mo>-</mo></msubsup></math>&nbsp;ion, the bond order is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:06:14', NULL),
(251729, '85,80,239,256', '<p>Two ice cubes are pressed over each other and unite to form one cube. Which force is responsible for holding them together?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:07:34', NULL),
(251730, '85,80,239,256', '<p>Resonance is not shown by:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:08:44', NULL),
(251731, '85,80,239,256', '<p>Ice has an open structure compared to water due to which it floats on water occupies a greater volume of space. The open structure of ice is due to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:10:09', NULL),
(251732, '85,80,239,256', '<p>Which of the following is most stable?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:11:03', NULL),
(251733, '85,80,239,256', '<p>o-hydroxy benzaldehyde, although contains enolic group but does not give test of group with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>F</mi><mi>e</mi><mi>C</mi><msub><mi>l</mi><mn>3</mn></msub></math>&nbsp;because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:12:53', NULL),
(251734, '85,80,239,256', '<p>Bond length decreases with:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:13:47', NULL),
(251735, '85,80,239,256', '<p>The molecule having three folds of axis of symmetry is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:14:39', NULL),
(251736, '85,80,239,256', '<p>Which force is strongest?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:15:16', NULL),
(251737, '85,80,239,256', '<p>The total number of valency electrons in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>PH</mi><mn>4</mn><mo>+</mo></msubsup></math>&nbsp;ion is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:15:48', NULL),
(251738, '85,80,239,256', '<p>Which pair represents isostructural species?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:17:47', NULL),
(251739, '85,80,239,256', '<p>The higher values of specific heat of water in comparison to other liquids is due to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:18:41', NULL),
(251740, '85,80,239,256', '<p>Hydrogen fluoride is a liquid unlike other hydrogen halides because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:20:09', NULL),
(251741, '85,80,239,256', '<p>Resonance is due to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:21:21', NULL),
(251742, '85,80,239,256', '<p>The total number of valency electrons for&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>PO</mi><mn>4</mn><mrow><mn>3</mn><mo>-</mo></mrow></msubsup></math>&nbsp;ion is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:21:58', NULL),
(251743, '85,80,239,256', '<p>Which of the following halides is least stable and has doubtful existence?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:23:08', NULL),
(251744, '85,80,239,256', '<p>The pair likely to form the strongest hydrogen bonding:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:24:40', NULL),
(251745, '85,80,239,256', '<p>An element X has 3 electrons in p-orbitals and also belongs to III period. Its molecular formula should be:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:25:49', NULL),
(251746, '85,80,239,256', '<p>As a result of resosance:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:26:28', NULL),
(251747, '85,80,239,256', '<p>Which explains that o-nitrophenol is more volatile than p-nitrophenol?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:27:45', NULL),
(251748, '85,80,239,256', '<p>Methanol and ethanol are miscible in water due to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:29:21', NULL),
(251749, '85,80,239,256', '<p>Which has an odd electron and shows paramagnetic character?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:30:23', NULL),
(251750, '85,80,239,256', '<p>Which of the following is correct?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:31:46', NULL),
(251751, '85,80,239,256', '<p>In a crystal, the atoms are located at the positions of:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:32:44', NULL),
(251752, '85,80,239,256', '<p>Which of the following bond requires the largest amount of energy to dissociate the bond concerned?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:34:16', NULL),
(251753, '85,80,239,256', '<p>The predominent intermolecular forces in hydrogen fluoride is due to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:35:21', NULL),
(251754, '85,80,239,256', '<p>Silicon has 4 electrons in the outermost orbit. In forming the bond:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:36:05', NULL),
(251755, '85,80,239,256', '<p>Silicon has 4 electrons in the outermost orbit.&nbsp; In forming the bond:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:36:54', NULL),
(251756, '85,80,239,256', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub></math>O boils at higher temperature than&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi></math>&nbsp;because it is capable of forming:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:37:49', NULL),
(251757, '85,80,239,256', '<p>The pairs of bases in DNA are held together by:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:38:25', NULL),
(251758, '85,80,239,256', '<p>Which compound shows hydrogen bonding?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:39:29', NULL),
(251759, '85,80,239,256', '<p>In the cyanide ion, the formal negative charge is on:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:40:07', NULL),
(251760, '85,80,239,256', '<p>The intermolecular attractive forces vary in the order:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:41:16', NULL),
(251761, '85,80,239,256', '<p>The bond that determines the secondary structure of a protein is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:41:59', NULL),
(251762, '85,80,239,256', '<p>Water has high heat of vaporization due to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:42:33', NULL),
(251763, '85,80,239,256', '<p>van der Waals&#39; forces between molecules depend upon:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:43:17', NULL),
(251764, '85,80,239,256', '<p>The attraction that non-polar molecules have for each other is primarily caused by;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:44:28', NULL),
(251765, '85,80,239,256', '<p>Acetic acid exists as dimer in benzene due to:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:45:27', NULL),
(251766, '85,80,239,256', '<p>Which is distilled first?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:46:28', NULL),
(251767, '85,80,239,256', '<p>Intramolecular hydrogen bonding is found in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-24 16:47:08', NULL),
(251768, '85,80,239,256', '<p>Which has the lowest bond angle?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:40:06', NULL),
(251769, '85,80,239,256', '<p>Compounds formed by&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi><msup><mi>p</mi><mn>3</mn></msup><msup><mi>d</mi><mn>2</mn></msup></math>&nbsp;-hybridization will have configuration:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:41:07', NULL),
(251770, '85,80,239,256', '<p>Linear combination of two hybridized orbitals, belonging to two atoms and each having one electron leads to :</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:41:58', NULL),
(251771, '85,80,239,256', '<p>Which combination is best explained by the coordinate covalent bond?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:43:05', NULL),
(251772, '85,80,239,256', '<p>Which oxide of nitrogen is isoelctronic with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:44:12', NULL),
(251773, '85,80,239,256', '<p>Which formula does not correctly represent the bonding capacity of the atom involved?</p>\r\n\r\n<p><img alt=\"\" src=\"https://school.achievam.com/upload/questionbank/question/que_1756086300.PNG\" style=\"height:129px; width:331px\" /></p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:45:13', NULL),
(251774, '85,80,239,256', '<p>pauling&#39;s electronegativity values of elements are useful in predicting:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:46:14', NULL),
(251775, '85,80,239,256', '<p>Which hybridization results tetrahedral orbital?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:47:03', NULL),
(251776, '85,80,239,256', '<p>For which of the following hybridizations the bond angle is maximum?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:48:02', NULL),
(251777, '85,80,239,256', '<p>The forces present in the crystals of naphthalene are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:48:52', NULL),
(251778, '85,80,239,256', '<p>In compound X, all the bond angles are exactly&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>109</mn><mo>&#176;</mo></msup></math>28&#39;. X is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:49:54', NULL),
(251779, '85,80,239,256', '<p>Which of the following has shortest carbon-carbon bond length?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:51:29', NULL),
(251780, '85,80,239,256', '<p>Among liq. HF, liq.&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub><mo>,</mo><mo>&#160;</mo><mi>C</mi><msub><mi>H</mi><mn>4</mn></msub><mo>,</mo><mo>&#160;</mo><mi>C</mi><msub><mi>H</mi><mn>3</mn></msub><mi>O</mi><mi>H</mi></math>&nbsp;and&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>N</mi><mn>2</mn></msub><msub><mi>O</mi><mn>4</mn></msub></math>, intermolecular hydrogen bond is expected.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:52:39', NULL),
(251781, '85,80,239,256', '<p>Which is expected to have linear structure?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:53:42', NULL),
(251782, '85,80,239,256', '<p>Which shows the highest lattice energy?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:54:10', NULL),
(251783, '85,80,239,256', '<p>Which of the following species has four lone pairs of electrons in its outer shell?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:54:54', NULL),
(251784, '85,80,239,256', '<p>An atom with atomic number 20 is most likely to combine chemically with the atom whose atomic number is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:55:24', NULL),
(251785, '85,80,239,256', '<p>Which set has strongest tendency to form anions?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:56:01', NULL),
(251786, '85,80,239,256', '<p>Which compound does not contain double bond or triple bond?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:57:04', NULL),
(251787, '85,80,239,256', '<p>When the hybridization state of carbon atom changes from&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi><msup><mi>p</mi><mn>3</mn></msup><mo>&#160;</mo><mi>t</mi><mi>o</mi><mo>&#160;</mo><mi>s</mi><msup><mi>p</mi><mn>2</mn></msup></math>&nbsp;and finally to sp, the angle between the hybridized orbitals:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:58:19', NULL),
(251788, '85,80,239,256', '<p>Which statement is not correct?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 01:59:53', NULL),
(251789, '85,80,239,256', '<p>More stronger bond is in:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:00:17', NULL),
(251790, '85,80,239,256', '<p>For the type of interactions; (I) Covalent bond, (II) van der Waals&#39; forces, (III) Hydrogen bonding, (IV) Dipole-dipole interaction, which represents the correct order of increasing stability?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:02:26', NULL),
(251791, '85,80,239,256', '<p>For a covalent solid, the units which occupy lattice points are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:03:01', NULL),
(251792, '85,80,239,256', '<p>Which one pair of atoms or ions will have same configuration?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:04:01', NULL),
(251793, '85,80,239,256', '<p>Which of the following molecules does not posses a permanent electric dipole moment?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:05:04', NULL),
(251794, '85,80,239,256', '<p>A molecule in which&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi><msup><mi>p</mi><mn>2</mn></msup></math>&nbsp;- hybrid orbitals are used by the central atom in forming covalent bond is</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:06:16', NULL),
(251795, '85,80,239,256', '<p>Which ion is not isoelectronic with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>O</mi><mrow><mn>2</mn><mo>-</mo></mrow></msup></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:07:18', NULL),
(251796, '85,80,239,256', '<p>The shape of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mi>C</mi><mi>I</mi><msubsup><mi>O</mi><mn mathvariant=\"italic\">3</mn><mo mathvariant=\"italic\">-</mo></msubsup></math>&nbsp;according to VSEPR model is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:08:16', NULL),
(251797, '85,80,239,256', '<p>Which of the following two are isostructural?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:09:37', NULL),
(251798, '85,80,239,256', '<p>In which of the following bond angle is maximum?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:10:29', NULL),
(251799, '85,80,239,256', '<p>Which one of the followinig molecules will form a linear polymeric structure due to H-bonding?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:12:54', NULL),
(251800, '85,80,239,256', '<p>Main axis of a diatomic molecule is Z, molecular orbital&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>P</mi><mi>x</mi></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>p</mi><mi>y</mi></msub></math>&nbsp;overlap to form which of the following orbtial?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:14:25', NULL),
(251801, '85,80,239,256', '<p>In X - H ..... Y. both X and Y are electronegative elements:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:15:46', NULL),
(251802, '85,80,239,256', '<p>In&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>NO</mi><mn>3</mn><mo>-</mo></msubsup></math>&nbsp;ion, number of bond pair and lone pair electrons are respectively.</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:16:25', NULL),
(251803, '85,80,239,256', '<p>In which of the following&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>p</mi><mi mathvariant=\"normal\">&#960;</mi><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mi>d&#960;</mi></math>&nbsp;bonding is observed?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:17:38', NULL),
(251804, '85,80,239,256', '<p>Which of the following statements is not correct for sigma and pi-bonds formed between two carbon atoms?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:19:30', NULL),
(251805, '85,80,239,256', '<p>In a regular octahedral molecule&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>M</mi><msub><mi>X</mi><mn>6</mn></msub></math>, the number of X - M - X bonds at&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>180</mn><mo>&#176;</mo></msup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:20:23', NULL),
(251806, '85,80,239,256', '<p>The pair in which the two species are isostructural:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:21:55', NULL),
(251807, '85,80,239,256', '<p>In&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi><mi>r</mi><msub><mi>F</mi><mn>3</mn></msub></math>&nbsp;molecule, the lone pair occupy equatorial position to minimiz:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:23:24', NULL),
(251808, '85,80,239,256', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mn>2</mn></msub></math>&nbsp;is dipolar, whereas&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi><mi>e</mi><msub><mi>F</mi><mn>2</mn></msub></math>&nbsp;is not. It is because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:26:17', NULL),
(251809, '85,80,239,256', '<p>In an octaheral structure, the pair of d-orbitals involved in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>d</mi><mn>2</mn></msup><mi>s</mi><msup><mi>p</mi><mn>3</mn></msup></math>&nbsp;hybridization is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:28:39', NULL),
(251810, '85,80,239,256', '<p>Which of the following is the electron-deficient molecule?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:29:51', NULL),
(251811, '85,80,239,256', '<p>Which is correct order for electron gain enthalpy?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:30:52', NULL),
(251812, '85,80,239,256', '<p>Which molecule has trigonal planar geometry?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:32:11', NULL),
(251813, '85,80,239,256', '<p>The molecule having permanent dipole moment is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:33:23', NULL),
(251814, '85,80,239,256', '<p>The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:34:11', NULL),
(251815, '85,80,239,256', '<p>Which is expected to show paramgnetism?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:35:24', NULL),
(251816, '85,80,239,256', '<p>The correct increasing covalent nature is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-25 02:36:53', NULL),
(251817, '85,80,239,256', '<p>Which is expected to show paramagnetism?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 07:53:11', NULL),
(251818, '85,80,239,256', '<p>The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 07:53:45', NULL),
(251819, '85,80,239,256', '<p>Which one of the following orders is not in according with the property stated against it?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 07:55:57', NULL),
(251820, '85,80,239,256', '<p>Which of the following is not a correct statement?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 07:57:31', NULL),
(251821, '85,80,239,256', '<p>Which of the following is not isotructural with&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><mi>i</mi><mi>C</mi><msub><mi>l</mi><mn>4</mn></msub></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 07:58:39', NULL),
(251822, '85,80,239,256', '<p>Which of the following species has a linear shape?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 07:59:24', NULL),
(251823, '85,80,239,256', '<p>The correct order regarding the electronegativity of hybrid orbitals of carbon is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:01:17', NULL),
(251824, '85,80,239,256', '<p>In which of the following molecules are all the bonds not equal?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:02:19', NULL),
(251825, '85,80,239,256', '<p>The electronegativity difference between N and F is greater than that between N and H, yet the dipole moment of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub></math>(1.5 D) is larger than that of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi><msub><mi>F</mi><mn>3</mn></msub></math>(0.2 D). This is because:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:06:20', NULL),
(251826, '85,80,239,256', '<p>Which of the following pairs are isostructural?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:08:11', NULL),
(251827, '85,80,239,256', '<p>The correct order of C-O bond length among the following is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:09:55', NULL),
(251828, '85,80,239,256', '<p>Which of the following posses maximum hydration energy?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:10:41', NULL),
(251829, '85,80,239,256', '<p>The element having lowest ionisation energy among the following is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:12:07', NULL),
(251830, '85,80,239,256', '<p>The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:13:45', NULL),
(251831, '85,80,239,256', '<p>What is the dominant intermolcular force or bond that must be overcome in converting liquid&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><msub><mi>H</mi><mn>3</mn></msub><mi>O</mi><mi>H</mi></math>&nbsp;to a gas?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:14:50', NULL),
(251832, '85,80,239,256', '<p>In which of the following molecules/ions&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>BF</mi><mn>3</mn></msub><mo>,</mo><mo>&#160;</mo><msubsup><mi>NO</mi><mn>2</mn><mo>-</mo></msubsup><mo>,</mo><mo>&#160;</mo><msubsup><mi>NH</mi><mn>2</mn><mo>-</mo></msubsup><mo>&#160;</mo><mi>and</mi><mo>&#160;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mi mathvariant=\"normal\">O</mi></math>&nbsp;the central atom is&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi><msup><mi>p</mi><mn>2</mn></msup></math>&nbsp;hybridized?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:20:52', NULL),
(251833, '85,80,239,256', '<p>Among the following which is the strongest oxidising agent?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:21:58', NULL),
(251834, '85,80,239,256', '<p>According to MO theory, which of the following lists ranks the nitrogen species in terms of increasing bond order?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:23:58', NULL),
(251835, '85,80,239,256', '<p>In the case of alkali metals, the covalent character decreases in the order:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:25:12', NULL),
(251836, '85,80,239,256', '<p>Which of the following oxides is not expected to react with sodium hydroxide?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:26:07', NULL),
(251837, '85,80,239,256', '<p>The state of hybridization of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>C</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>C</mi><mn>3</mn></msub><mo>,</mo><mo>&#160;</mo><msub><mi>C</mi><mn>5</mn></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>C</mi><mn>6</mn></msub></math>&nbsp;of the hydrocarbon,</p>\r\n\r\n<p><img alt=\"\" src=\"https://school.achievam.com/upload/questionbank/question/que_1756283234.png\" style=\"height:120px; width:389px\" /></p>\r\n\r\n<p>is in the following sequence:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:28:33', NULL),
(251838, '85,80,239,256', '<p>Amongst the elements with following electronic configurations, which one of them may have the highest ionization energy?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:30:21', NULL),
(251839, '85,80,239,256', '<p>In which one of the following species, the central atom has the type of hybridization which is not the same as that present in other three?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:35:27', NULL),
(251840, '85,80,239,256', '<p>Which of the following species does not exist under normal conditions?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:36:24', NULL),
(251841, '85,80,239,256', '<p>The correct order of increasing bond angles in the following species is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:38:51', NULL),
(251842, '85,80,239,256', '<p>In which of the following pairs of molecules/ions, the central atom has&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi><msup><mi>p</mi><mn>2</mn></msup></math>-hybridization?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:40:33', NULL),
(251843, '85,80,239,256', '<p>Among the following elements Ca, Mg, P and CI the order of increasing atomic radius is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:41:34', NULL),
(251844, '85,80,239,256', '<p>Among the following which has the highest cation to anion size ratio?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:42:55', NULL),
(251845, '85,80,239,256', '<p>In which of the following molecules, the central atom does not have&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi><msup><mi>p</mi><mn>3</mn></msup></math>&nbsp;- hybridization?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:44:05', NULL),
(251846, '85,80,239,256', '<p>How many bridging oxygen atoms are present in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>P</mi><mn>4</mn></msub><msub><mi>O</mi><mn>10</mn></msub></math>&nbsp;?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:44:36', NULL),
(251847, '85,80,239,256', '<p>Some of the properties of the two species,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>NO</mi><mn>3</mn><mo>-</mo></msubsup><mo>&#160;</mo><mi>and</mi><mo>&#160;</mo><msub><mi mathvariant=\"normal\">H</mi><mn>3</mn></msub><msup><mi mathvariant=\"normal\">O</mi><mo>+</mo></msup></math>&nbsp;are described below. Which one of them is correct?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:46:22', NULL),
(251848, '85,80,239,256', '<p>Which of the following compounds has the lowest melting point?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:47:51', NULL),
(251849, '85,80,239,256', '<p>The correct order of increasing bond length of C - H, C - O, C - C and C&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><mo>=</mo></math>C is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:50:20', NULL),
(251850, '85,80,239,256', '<p>For the four successive transition elements (Cr, Mn, Fe and Co) the stability of +2 oxidation state will be there in which of the following order?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:52:09', NULL),
(251851, '85,80,239,256', '<p>Which of the two ions from the list given below that have the geometry that is explained by the same hybridization of orbitals,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>NO</mi><mn>2</mn><mo>-</mo></msubsup><mo>,</mo><mo>&#160;</mo><msubsup><mi>NO</mi><mn>3</mn><mo>-</mo></msubsup><mo>,</mo><mo>&#160;</mo><msubsup><mi>NH</mi><mn>2</mn><mo>-</mo></msubsup><mo>,</mo><mo>&#160;</mo><msubsup><mi>NH</mi><mn>4</mn><mo>+</mo></msubsup><mo>,</mo><mo>&#160;</mo><msup><mi>SCN</mi><mo>-</mo></msup></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:54:37', NULL),
(251852, '85,80,239,256', '<p>Which of the following has the minimum bond length?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:55:45', NULL),
(251853, '85,80,239,256', '<p>Which one of the following pairs is isostructural (i.e., having the same shape and hybridization) ?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 08:59:08', NULL),
(251854, '85,80,239,256', '<p>The pair of species with the same bond order is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 09:02:20', NULL),
(251855, '85,80,239,256', '<p>Bond order of 1.5 is shown by:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 09:03:43', NULL),
(251856, '85,80,239,256', '<p>Identify the wrong statement in the following:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 09:05:57', NULL),
(251857, '85,80,239,256', '<p>During change of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mo>&#160;</mo><mi>to</mi><mo>&#160;</mo><msubsup><mi mathvariant=\"normal\">O</mi><mn>2</mn><mo>-</mo></msubsup></math>&nbsp;ion, the electron adds on which one of the following orbitals?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 09:09:12', NULL),
(251858, '85,80,239,256', '<p>Which one of the following does not correctly represent the correct order of the property indicated against it?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 09:12:40', NULL),
(251859, '85,80,239,256', '<p>For diatomic species are listed below. Identify the correct order in which the bond order is increasing in them:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 09:49:27', NULL),
(251860, '85,80,239,256', '<p>Which of the following is electron-deficient?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 09:51:13', NULL),
(251861, '85,80,239,256', '<p>Which one of the following molecules contains no&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi mathvariant=\"normal\">&#960;</mi><mo>-</mo><mi>bond</mi></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 09:52:27', NULL),
(251862, '85,80,239,256', '<p>Which of the following is a polar molecule?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 09:54:46', NULL),
(251863, '85,80,239,256', '<p>Which of the following paramagnetic?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 09:56:20', NULL),
(251864, '85,80,239,256', '<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>X</mi><mi>e</mi><msub><mi>F</mi><mn>2</mn></msub></math>&nbsp;is isostructural with:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 09:58:48', NULL),
(251865, '85,80,239,256', '<p>Dipole-induced dipole interactions are present in which of the following pairs?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-27 10:01:23', NULL),
(251866, '85,80,239,256', '<p>Which of the following molecules has the maximum dipole moment?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 02:30:56', NULL),
(251867, '85,80,239,256', '<p>Which one of the following species has plane triangular shape?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 02:34:42', NULL),
(251868, '85,80,239,256', '<p>Which of the following organic compounds has same hybridization as its combustion product-<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mfenced><mrow><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></mrow></mfenced></math>?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 02:35:57', NULL),
(251869, '85,80,239,256', '<p>The species Ar,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>K</mi><mo>+</mo></msup><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><mi>C</mi><msup><mi>a</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></math>&nbsp;contain the same number of electrons. In which order do their radii increase?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 06:30:58', NULL),
(251870, '85,80,239,256', '<p>Which of the following pairs of ions are isoelectronic and isostructural?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 07:45:42', NULL),
(251871, '85,80,239,256', '<p>Which of the following options represents the correct bond order?</p>\r\n\r\n<p>&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 07:48:45', NULL),
(251872, '85,80,239,256', '<p>The total number of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi mathvariant=\"normal\">&#960;</mi></math>-bond electrons in the following structure is:</p>\r\n\r\n<p><img alt=\"\" src=\"https://school.achievam.com/upload/questionbank/question/que_1756367403.png\" style=\"height:120px; width:251px\" /></p>\r\n\r\n<p>&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 07:50:18', NULL),
(251873, '85,80,239,256', '<p>Maxmum bond angle at nitrogen is present in which the following?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 07:53:46', NULL),
(251874, '85,80,239,256', '<p>Which of the following species contains equal number of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>&#963;</mi><mo>-</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>-</mo><mi>&#960;</mi></math>-bond?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 07:56:16', NULL),
(251875, '85,80,239,256', '<p>The formation of the oxide ion&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mi mathvariant=\"normal\">O</mi><mrow><mn>2</mn><mo>-</mo></mrow></msup><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo></math>, from oxygen atom requires first an exothermic and then an endothermic step as shown below:</p>\r\n\r\n<p><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi mathvariant=\"normal\">O</mi><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msup><mi mathvariant=\"normal\">e</mi><mo>-</mo></msup><mo>&#8594;</mo><msup><mi mathvariant=\"normal\">O</mi><mo>-</mo></msup><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>;</mo><mo>&#160;</mo><msub><mo>&#8710;</mo><mi mathvariant=\"normal\">f</mi></msub><msup><mi mathvariant=\"normal\">H</mi><mi mathvariant=\"normal\">&#920;</mi></msup><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>141</mn><mo>&#160;</mo><mi>kJ</mi><mo>&#160;</mo><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mspace linebreak=\"newline\"/><msup><mi mathvariant=\"normal\">O</mi><mo>-</mo></msup><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><msup><mi mathvariant=\"normal\">e</mi><mo>-</mo></msup><mo>&#8594;</mo><msup><mi mathvariant=\"normal\">O</mi><mrow><mn>2</mn><mo>-</mo></mrow></msup><mo>(</mo><mi mathvariant=\"normal\">g</mi><mo>)</mo><mo>;</mo><mo>&#160;</mo><msub><mo>&#8710;</mo><mi mathvariant=\"normal\">f</mi></msub><msup><mi mathvariant=\"normal\">H</mi><mi mathvariant=\"normal\">&#920;</mi></msup><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>+</mo><mn>780</mn><mo>&#160;</mo><mi>kJ</mi><mo>&#160;</mo><msup><mi>mol</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math></p>\r\n\r\n<p>Thus process of formation of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>O</mi><mrow><mn>2</mn><mo>-</mo></mrow></msup></math>&nbsp;in gas phase is unfavourable even though&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>O</mi><mrow><mn>2</mn><mo>-</mo></mrow></msup></math>&nbsp;is isoelectronic with neon. It is due to the fact:that:</p>\r\n\r\n<p>&nbsp;</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 08:02:02', NULL),
(251876, '85,80,239,256', '<p>Decreasing order of stability of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi mathvariant=\"normal\">O</mi><mn>2</mn></msub><mo>,</mo><mo>&#160;</mo><msubsup><mi mathvariant=\"normal\">O</mi><mn>2</mn><mo>-</mo></msubsup><mo>,</mo><mo>&#160;</mo><msubsup><mi mathvariant=\"normal\">O</mi><mn>2</mn><mo>+</mo></msubsup><mo>&#160;</mo><mi>and</mi><mo>&#160;</mo><msubsup><mi mathvariant=\"normal\">O</mi><mn>2</mn><mrow><mn>2</mn><mo>-</mo></mrow></msubsup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 08:07:14', NULL),
(251877, '85,80,239,256', '<p>Which of the statements given below is incorrect?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 08:09:37', NULL),
(251878, '85,80,239,256', '<p>In which of the following pairs, both the species are not isostructural</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 08:11:02', NULL),
(251879, '85,80,239,256', '<p>In which of the following options the order of arrangement does not agree with the variation of property indicated against it?</p>', 'Medium', 'checkbox', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 08:14:44', NULL),
(251880, '85,80,239,256', '<p>The pair of electron in the given carbanion,&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msub><mi>CH</mi><mn>3</mn></msub><mi mathvariant=\"normal\">C</mi><mo>&#160;</mo><mo>&#8801;</mo><msup><mi mathvariant=\"normal\">C</mi><mi mathvariant=\"normal\">&#920;</mi></msup></math>, is present in which of the following orbitals?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 08:16:48', NULL),
(251881, '85,80,239,256', '<p>Which one of the following compounds shows the presence of intramolecular hydrogen bond?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 08:19:20', NULL),
(251882, '85,80,239,256', '<p>The hybridization of atomic orbitals of nitrogen in&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msubsup><mi>NO</mi><mn>2</mn><mo>+</mo></msubsup><mo>,</mo><mo>&#160;</mo><msubsup><mi>NO</mi><mn>3</mn><mo>-</mo></msubsup><mo>&#160;</mo><mi>and</mi><mo>&#160;</mo><msubsup><mi>NH</mi><mn>4</mn><mo>+</mo></msubsup></math>&nbsp;respectively are:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 08:23:39', NULL),
(251883, '85,80,239,256', '<p>Which of the following pairs of ions is isoeletronic and isostructural?</p>', 'Medium', 'checkbox', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 08:25:22', NULL),
(251884, '85,80,239,256', '<p>The correct geometry and hybridization for&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>X</mi><mi>e</mi><msub><mi>F</mi><mn>4</mn></msub></math>&nbsp;are:</p>', 'Medium', 'checkbox', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 08:28:04', NULL),
(251885, '85,80,239,256', '<p>Among the following, which one is a wrong statement?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 08:29:44', NULL),
(251886, '85,80,239,256', '<p>The species having bond angles of&nbsp;<math xmlns=\"http://www.w3.org/1998/Math/MathML\" class=\"wrs_chemistry\"><msup><mn>120</mn><mo>&#176;</mo></msup></math>&nbsp;is:</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 08:30:43', NULL),
(251887, '85,80,239,256', '<p>Which of the following pairs of compounds is isoelctronic and isostructural?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 08:32:33', NULL),
(251888, '85,80,239,256', '<p>Which one of the following pairs of species have the same bond order?</p>', 'Medium', 'radio', NULL, 1, 1, 129, 1, 'https://school.achievam.com/quser/questions/doadd', '2025-08-28 08:34:14', NULL);
