In the presence of PbS and ZnS in a mineral, the froth flotation process requires NaCN because:

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ZnS goes into the solution as soluble complex [Zn(CN)4]2-

Zn(CN)2 is precipitated

PbS forms soluble complex Na2[Pb(CN)4]

ZnS forms insoluble complex [Zn(CN)4]2-

answer is A.

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Detailed Solution

ZnS forms water soluble complexZnS+4NaCN→4Na++Zn(CN)42−+S−2 Water soluble

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