`NaCN` is sometimes added in the froth flotation process as a depressant when `ZnS` and `PbS` minerals are expected because `:`A. Pb `(CN)_(2)` is precipitated while there is no effect on ZnS.B. ZnS forms soluble complex `Na_(2)[Zn(CN)_(4)]` while PbS forms froth.C. PbS forms solumbe complex `Na_(2)[Pb(CN)_(4)]` while ZnS froms froth.D. Sillccious impurities settle down on the bottom.

`NaCN` is sometimes added in the froth flotation process as a depressa

1.	`NaCN` is sometimes added in the froth flotation process as a depressant when `ZnS` and `PbS` minerals are expected because `:`A. Pb `(CN)_(2)` is precipitated while there is no effect on ZnS.B. ZnS forms soluble complex `Na_(2)[Zn(CN)_(4)]` while PbS forms froth.C. PbS forms solumbe complex `Na_(2)[Pb(CN)_(4)]` while ZnS froms froth.D. Sillccious impurities settle down on the bottom.
Answer» Correct Answer - B

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