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Colour and Solubility

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A solution of metal ion when treated with KI gives a red precipitate which dissolves in excess KI to give a colourless solution. Moreover, the solution of metal ion on treatment with a solution of cobalt(II) 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 $H g^{2 +}$
A solution of metal ion when treated with $K I$ gives a red precipitate which dissolves in excess $K I$ to give a colourless solution. Moreover, the solution of metal ion on treatment with a solution of cobalt(II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion is $H g^{2 +}$ .

$H g_{2} + K I \to H g I_{2} (red ppt)$

$H g I_{2} + K I \to K_{2} H g I_{4}$

$(S C N)_{2} \to H g (S C N)_{2} (blue crystalline precipiates )$

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