<p>(i) Which ion amongst the following is colourless and why?</p>

<p><span class="equation">\(Ti^{4+}, Cr^{3+}, V^{3+}\)</span></p>

<p>(Atomic number of Ti= 22, Cr = 24, V = 23)</p>

<p>(ii) Why is&nbsp;<span class="equation">\(Mn^{2+}\)</span>much more resistant than <span class="equation">\(Fe^{2+}\)</span>towards oxidation?​​​​​​​​​​​​​​</p>

<p>(iii) Highest oxidation state of a metal is shown in its oxide or fluoride only. Justify the statement.</p>