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Ammonia

An aqueous so...

Question

An aqueous solution of ${M C l}_{2}$ containing excess $K C N$ , when treated with $H_{2} S$ will precipitate $M S$ , only if $M$ is _________ .

A

N i

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B

C o

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C

C u

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D

C d

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Solution

The correct option is D $C d$
In presence of $K C N$ , only $C d$ is precipitated as sulphide on passing $H_{2} S$ . This is because, the second ionization of potassium cadmicyanide is higher than that of potassium cupro cyanide (or similar complexes of $C o$ and $N i$ ), so that, sufficient $C d (I I)$ ions are present in solution. Hence, when hydrogen sulphide is passed, only $C d S$ is precipitated.

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