Chemistry

Problem

A solution of a metal ion, when treated with KI, gives a red precipitate which dissolves in an excess of KI to give a colourless solution. Moreover, the solution of the metal ion on treatment with a solution of cobalt (II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ions is: a.

\text{Pb}^{2+}

\text{Hg}^{2+}

\text{Cu}^{2+}

\text{Co}^{2+}

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