<p>Account the following:</p>

<p>(i) Transition metals form large number of complex compounds.</p>

<p>(ii) The lowest oxide of transition metal is basic whereas the highest oxide is amphoteric or acidic.</p>

<p>(iii)&nbsp;<span class="equation">\(E^0\)</span>&nbsp;value for the <span class="equation">\(Mn^{3+}/Mn^{2+}\)</span>&nbsp;couple is highly positive (+1.57V) as compared to <span class="equation">\(Cr^{3+}/Cr^{2+}\)</span>​​​​​​​​​​​​​​​​​​​​​</p>