Which compound does not dissolve in hot $d i l . H N O_{3}$ ?

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 $H g S$
Option (A) is correct.
$H g S$ does not dissolve in hot $d i l . H N O_{3}$ while rest three are second group radicals and dissolve in hot $d i l . H N O_{3}$ .

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