1.

In a mixture of PbS, ZnS and FeS_2 each component is separated from other by using the reagents in the following sequence in froth floatation process.

Answer»

Potassium ethyl xanthate, KCN. 
Potassium ethyl xanthate, KCN, NAOH, copper sulphate, acid. 
`KCN, CuSO_4` acid. 
Potassium ethyl xanthate, copper sulphate, NaOH, KCN, acid. 

Solution :Potassium ethyl xanthate is collector. KCN and NaOH depresses the floatation property of `FeS_2` and ZnS. Thus only PbS forms the froth. `CuSO_4` is then added to ACTIVATE the FROTHING character of ZnS and only ZnS forms the froth. The REMAINING slurry is acidified and Fes, floats along with the froth.


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