When $ZnS$ and $PbS$ minerals are present together,then $NaCN$ is added to separate them in the froth floatation process as a depressant,because
- A$Pb(CN)_2$ is precipitated while no effect on $ZnS$
- B$ZnS$ forms soluble complex $Na_2[Zn(CN)_4]$
- C$PbS$ forms soluble complex $Na_2[Pb(CN)_4]$
- DThey cannot be separated by adding $NaCN$
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