A) potassium cyanide
B) sodium cyanide
C) silver cyanide
D) sodium sulphide
Correct Answer: B
Solution :
Sodium cyanide, NaCN, is used as a depressant to separate lead sulphide (PbS) and zinc sulphide (ZnS) as it depresses the ability of ZnS to form froth while does not affect the ability of PbS.You need to login to perform this action.
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