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J & K CET Medical J & K - CET Medical Solved Paper-2010

  • question_answer
    The depressant used to separate lead sulphide and zinc sulphide ores is

    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\[PbS\].


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