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NaCN is sometimes added in the forth flotation process as a depressant when ZnS and PbS minerals are expected because : 

(A) Pb(CN)2 is precipitated while no effect on ZnS. 

(B) ZnS forms soluble complex Na2[Zn(CN)4] while PbS forms froth 

(C) PbS forms soluble complex Na2[Pb(CN)4] while ZnS forms froth. 

(D) NaCN is never added in froth floatation process.

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(B) ZnS forms soluble complex Na2[Zn(CN)4] while PbS forms froth.

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