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Question

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 while no effect on ZnS.
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B
ZnS forms soluble complex Na2[Zn(CN)4] while PbS forms froth
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C
PbS forms soluble complex Na2[Pb(CN)4] while ZnS forms froth
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D
NaCN is never added in froth floatation process
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Solution

The correct option is B ZnS forms soluble complex Na2[Zn(CN)4] while PbS forms froth
Both ZnS and PbS forms froth with collector in the froth flotation process.
Addition of NaCN (depressant), selectively prevents ZnS from coming to the froth by forming a soluble complex Na2[Zn(CN)4] but allows PbS to come with the froth. So, option (b) is the correct option.

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