Analytical ChemistryHard
Question
Which of the following sulphides do not dissolve in 50% HNO3 but dissolve in aquaregia ?
Options
A.CoS
B.NiS
C.CuS
D.HgS
Solution
CuS dissolves in 50% HNO3 ; 3CuS + 8HNO3 → 3Cu2+ + 6NO3- + 3S↓ + 2NO↑ + 4H2O
But NiS, CoS and HgS do not dissolve in 50% HNO3 and dissolve in aquaregia forming their chlorides.
But NiS, CoS and HgS do not dissolve in 50% HNO3 and dissolve in aquaregia forming their chlorides.
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