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Q.

NaCN is sometimes added in the froth flotation process as a depressant when ZnS and PbS minerals are expected because:

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a

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

b

ZnS forms soluble complex Na2[Zn(CN)4] while PbS forms froth

c

PbS forms soluble complex Na2[Pb(CN)4] while ZnS forms froth

d

NaCN is never added in froth flotation process

answer is B.

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Detailed Solution

ZnS+4NaCN→Na2[Zn(CN)4]+Na2SPbS+NaCN→No such complex formation.
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