Question

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

A
NiS
B
CoS
C
HgS
D
CdS

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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