<p>Assign reason for each of the following:</p>

<p>(i) Manganese exhibits the highest oxidation state of +7 among the 3d series of transition elements.</p>

<p>(ii) Transition metals and their compounds are generally found to be good catalysts in chemical reactions.</p>

<p>(iii)&nbsp;<span class="equation">\(Cr^{2+}\)</span>&nbsp;is reducing in nature while with the same d-orbital configuration&nbsp;<span class="equation">\({(d^4)}\)</span><span class="equation">\(Mn^{3+}\)</span>&nbsp;is an oxidising agent.</p>

<p>(iv) Zn has lowest enthalpy of atomization.</p>

<p>(v)&nbsp;<span class="equation">\(Cu^{+}\)</span>&nbsp;is unstable in an aqueous solution.</p>