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CGP EDU Academic Team
Published on: August 13, 2026
Which of the following sulphides do not dissolve in 50% HNO 3 but dissolve in aquaregia ?
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(a,b,d)CuS dissolves in 50% HNO 3 ; 3CuS + 8HNO 3 
3Cu 2+ + 6NO 3 – + 3S ↓ + 2NO + 4H 2 OBut NiS, CoS and HgS do not dissolve in 50% HNO 3 and dissolve in aquaregia forming their chlorides.
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