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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

Verified by Experts

The correct Answer is:
b
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Knowledge Check

  • When ZnS and PbS minerals are present together, Then NaCN added to separate them in the froth floation process as a depressant, beacuse :-

    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
    If decreases the floatation property of PbS by making it hydrophillic

  • When ZnS and PbS minerals are present together, NaCN is added to separate them in froth floatation process because :

    A
    `Pb(CN)_(2)` is percipitated while there is 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
    both (1) and (2)

  • The substance added in water in the froth floatation process is

    A
    Soap powder
    B
    Pine oil
    C
    Coconut oil
    D
    None of these

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