<p>Following ions are given:</p>

<p><span class="equation">\(Cr^{2+}, Cu^{2+}, Cu^{+}, Fe^{2+}, Fe^{3+}, Mn^{3+}\)</span></p>

<p>Identify the ion which is</p>

<p>(i) a strong reducing agent.</p>

<p>(ii) unstable in aqueous solution.</p>

<p>(iii) a strong oxidising agent.</p>

<p>Give suitable reason in each.</p>