<p>Give reasons:</p>

<p>(i)&nbsp;<span class="equation">\(E^{0}\)</span>&nbsp;value for <span class="equation">\(Mn^{3+}/Mn^{2+}\)</span>&nbsp;couple is much more positive than that for <span class="equation">\(Fe^{2+}/Fe^{2+}\)</span>​​​​​​​</p>

<p>(ii) Iron has higher enthalpy of atomization than that of copper.</p>

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