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Colour and Solubility

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Question

A solution of a metal ion when treated with $K I$ gives a red precipitate which dissolves in excess $K I$ to give a colorless solution. Moreover, the solution of metal ion on treatment with a solution of cobalt $(I I)$ thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion is :

A

{P b}^{2 +}

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B

{H g}^{2 +}

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C

{C u}^{2 +}

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D

{C o}^{2 +}

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Solution

The correct option is A ${H g}^{2 +}$
$H g^{2 +} + K I \to H g I_{2}$ (Red Ppt.)
$H g I_{2} + K I \to K_{2} H g I_{4}$ ( Soluble)
$H g I^{2 +} + C o (S C N)_{2} \to H g (S C N)_{2}$ (Blue crystalline ppt.)

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