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When ZnS and PbS minearls are present to...

When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :

A

`Pb(CN)_2` is precipitated while no effect on ZnS

B

ZnS forms soluble complex `Na_2[Zn(CN)_4]`

C

PbS forms soluble complex `Na_2[Pb(CN)_4]`

D

They cannot be separated by adding NaCN

Text Solution

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The correct Answer is:
B
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  2. Froth floatation process is based on

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  9. (I) FeCr2 O4 + NaOH + air to (A) + Fe2O3 (II) (A) + (B) to NaCr2O7 ...

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