Which of the following metal sulphide is soluble in hot and cone. ${HNO}_{3}$ as well as aq. KCN?

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${Ag}_{2} S$

$PbS$

$CuS$

$CdS$

answer is A.

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Detailed Solution

Copper sulphide is soluble in hot and concentrated nitric acid as well as aqeous potassium cyanide. Copper sulphide dissolves in nitric acid due to the formation of copper nitrate.

$3 CuS + 8 {HNO}_{3} \to 3 Cu {({NO}_{3})}_{2} + 2 NO + 3 S + 4 H_{2} O$

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