Which of the following sulphides do not dissolve in `50% HNO_(3)` but dissolve in aquaregia ?
Which of the following sulphides do not dissolve in `50% HNO_(3)` but dissolve in aquaregia ?
A. `CoS`
B. `NiS`
C. `CuS`
D. `HgS`
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Correct Answer - A,B,D
`CuS` dissolves in `50% HNO_(3) , 3CuS+8HNO_(3)to3Cu^(2+)+6NO_(3)^(-) +3S darr +2NOuarr +4H_(2)O`
But `NiS, CoS` and `HgS` do not dissolve in `50% HNO_(3)` and dissolve in aquaregia forming their chlorides.
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