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Question

NaCN is sometimes added in the froth flotation process as a depressant when ZnS and PbS are to be separated in the given sample because:

A
Pb(CN)2 is precipitated, no effect on ZnS
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B
ZnS forms a soluble complex, PbS goes up with the froth
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C
NaCN reacts with ZnS to form Na2[Zn(CN)4]
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D
Zn(CN)2 is precipitated, no effect on PbS
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Solution

The correct option is C NaCN reacts with ZnS to form Na2[Zn(CN)4]
A depressant helps in separating two sulphide ores by selective prevention of froth formation by one of the ores allowing the other one to form froth.
ZnS forms a soluble complex Na2[Zn(CN)4] with NaCN while PbS does not and goes up with the froth.
4NaCN+ZnSNa2[Zn(CN)4]+Na2S

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