Find the number of sulphide compounds which are not soluble in hot and $dil . {HNO}_{3}$ but soluble in aqua regia
${Ag}_{2} S, PbS, HgS, CdS$

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answer is 1.

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Detailed Solution

The sulphide compounds which are not soluble in hot and $dil . {HNO}_{3}$ but soluble in aqua regia is Mercury sulfide. There is only one such molecule.

Thus, the correct answer is 1.

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