NaCN is sometimes added in the froth flo...

NaCN is sometimes added in the froth floatation process as a depressant, when ZnS and PbS mineral are extracted because

ZnS forms soluble complex `Na_(2)[Zn(CN)_(4)]` while PbS forms froth.

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

PbS forms soluble complex `Na_(2)[Pb(CN)_(4)]` while ZnS forms froth.

NaCN is never added in Froth floatation process.

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The correct Answer is:

ZnS forms soluble complex `Na_(2)[Zn(CN)_(4)]` while PbS forms froth.

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