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A solution of a metal ion when treated with $Kl$ gives a red precipitate which dissolves in excess $Kl$ 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:

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${Pb}^{2 +}$

${Hg}^{2 +}$

${Cu}^{2 +}$

${Co}^{2 +}$

answer is B.

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Detailed Solution

${Hg}^{2 +} \overset{KI}{⟶} \underset{(scarlet red)}{{HgI}_{2}} ↓ \overset{Excess KI}{\to} K_{2} [{HgI}_{4}]$

$\frac{{Co}^{2 +} + 4 S {CN}^{-}}{}$ $Co [Hg (SCN)_{4}] ↓$

$(Deep blue crystalline ppt .)$

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