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Which of the following compound is not soluble in cone. (50%) HNO₃ ?

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PbS

Ag₂S

(Hg and HgS)

None of these

answer is B.

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Detailed Solution

Hot, diluted HNO₃ does not dissolve $HgS$ .

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

Thus, the Pb and $HgS$ sulphides dissolve in dilute HNO₃ to produce the corresponding nitrates.

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