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An ore contains Pbs with impurity Zns. NaCN is added in the froth flotation process ZnS does not form the froth because 

(a)  NaCN forms a complex of ZnS on surface of ZnS 

(b)  ZnS is not wetted by pine oil 

(c)   ZnS is wetted by H2

(d)   NaCN reacts with ZnS ionic compound 

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(a)  NaCN forms a complex of ZnS on surface of ZnS

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