1.

NaCN is added in froth floation process process with ZnS and PbS minerals because

Answer»

`Pb(CN)_2` is precipitated while no effect on ZnS
ZnS forms soluble complex while PbS forms froth
it ACTS as a depressant
NaCN is never ADDED in froth FLOATATION process.

Solution :`NaCN` acts as a depressant when `ZnS, PbS` are present in the mineral. ZnS forms soluble complex `Na_(2)[ZN(CN)_(4)]` and PbS forms froth.


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