Which compound does not dissolve in hot dilute $H N O_{3}$ ?

H g S

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P b S

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C u S

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C d S

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Solution

The correct option is A $H g S$
$H g S$ does not dissolve in hot diluted $H N O_{3}$
$3 P b S + 8 H N O_{3} ⟶ 3 P b (N O_{3})_{2} + 2 N O + 3 S + 4 H_{2} O$
$3 C u S + 8 H N O_{3} ⟶ 3 C u (N O_{3})_{2} + 2 N O + 3 S + 4 H_{2} O$
$3 C d S + 8 H N O_{3} ⟶ 3 C d (N O_{3})_{2} + 2 N O + 3 S + 4 H_{2} O$
Thus the sulphides of $P b, C u$ and $C d$ dissolves in diluted $H N O_{3}$ forming respective nitrates.

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