1.

`NaCN` is sometimes added in the froth flotation process as a depressant when `ZnS` and `PbS` minerals are expected because `:`A. ZnS from soluble comple `Na_2[Zn(CN)_(4)]` while PbS forms frothB. `Pb(CN)_(2)` is precipitated while no effect on ZnSC. PbS forms soluble complex ` Na_(2)[Pb(CN)_(4)]` while ZnS forms frothD. NaCN is never added in froth floatation process

Answer» Correct Answer - A
NaCN acts as a depressant for ZnS but does not prevent PbS from forming the froth .


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