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NaCN is sometimes added in the froth floatation process as a depressant when mineral contains ZnS and PbS because

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$P b {(C N)}_{2}$ is precipitated while there is no effect of ZnS.

ZnS forms soluble complex ${Na}_{2} [Zn (CN)_{4}]$ while PbS forms froth

PbS forms soluble complex ${Na}_{2} [Pb (CN)_{4}]$ while ZnS forms froth

Silicious impurities settle down on the bottom.

answer is B.

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Detailed Solution

$Z n S + 4 N a C N \to N a_{2} [Z n {(C N)}_{4}] + N a_{2} S$

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