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Q.

Find the number of sulphide compounds which are not soluble in hot and dil. HNO3 but soluble in aqua regia

Ag2S, 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. HNO3 but soluble in aqua regia is Mercury sulfide. There is only one such molecule.

Thus, the correct answer is 1.

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