1.

When ZnS and PbS minerals are present together, Then NaCN added to separate them in the froth floation process as a depressant, beacuse :-

Answer»

`Pb (CN)_(2)` is PRECIPITATED while no EFFECT on ZnS
ZnS forms soluble COMPLEX `Na_(2)[Zn(CN)_(4)]`
PbS forms soluble complex `Na_(2)[Pb (CN_(4))]`
If decreases the floatation property of PbS by making it hydrophillic

Answer :B


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