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Question

Which of the following sulphides are soluble only in aqua-regia?


A
NiS
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B
CoS
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C
HgS
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D
CdS
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Solution

The correct options are
A $$NiS$$
B $$CoS$$
C $$HgS$$
Option (A),(B),(C) are correct. $$NiS$$,$$CoS$$,$$HgS$$ are soluble in aquaregia  while $$CdS$$ dissolves in $$conc. HNO_3$$.

Chemistry

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