<p>Account for the following:</p>

<p>(a) Transition elements show variable oxidation states.</p>

<p>(b)&nbsp;<span class="equation">\(E^{0}_{Cu^{2+}/Cu)}\)</span>&nbsp;value for copper is highly positive​​​​​​​</p>

<p>(c)&nbsp;<span class="equation">\(Cr^{2}\)</span>&nbsp;is a strong reducing agent.​​​​​​​</p>