A) \[ZnS\]forms soluble complex\[N{{a}_{2}}[Zn{{(CN)}_{4}}]\]while\[PbS\] forms froth
B) \[Pb{{(CN)}_{2}}\]is precipitated while no effect on \[ZnS\]
C) \[PbS\]forms soluble complex\[N{{a}_{2}}[Pb{{(CN)}_{4}}]\] while\[ZnS\]form froth
D) \[NaCN\]is never added in froth floatation Process
Correct Answer: A
Solution :
\[NaCN\]is used as a depressant in the separation and concentration of\[ZnS\]and\[PbS\] ore. Here,\[NaCN\]acts as a depressant for\[ZnS\] but does not prevent\[PbS\]from forming the froth.
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