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 whhile no effect on `ZnS`.B. `ZnS` forms solubel complex `Na_(2)[Zn(CN)_(4)]` while `PbS` forms froth.C. `PbS` froms soluble complex `Na_(2)[Pb(CN)_(4)]` while `ZnS` forms froth.D. `NaCN` is never added in froth floatation process.

Answer» Correct Answer - 2
`ZnS+4NaCNrarrNa_(2)[Zn(CN)_(4)]+Na_(2)S`
`PbS+NaCNrarr`No such complex formation


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