<p>Assign suitable reasons for the following:</p>

<p>(i) The&nbsp;<span class="equation">\(Mn^{2+}\)</span>compounds are more stable than <span class="equation">\(Fe^{2+}\)</span>&nbsp;towards oxidation to their +3 state.​​​​​​​​​​​​​​</p>

<p>(ii) In the 3d series from Sc(Z = 21) to Zn(Z = 30), the enthalpy of atomization of Zn is the lowest.</p>

<p>(iii)&nbsp;<span class="equation">\(Sc^{3+}\)</span>is colourless in aqueous solution whereas <span class="equation">\(Ti^{3+}\)</span>&nbsp;is coloured.​​​​​​​​​​​​​​</p>