In the froth floatation process, zinc sulphide and lead sulphide can be separated by
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a
using collectors
b
adjusting the proportion of oil to water
c
using depressant
d
using froth stabilisers
answer is B.
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Detailed Solution
Froth floatation method is used to extract metal from sulphide ore. ZnS and PbS can be separated by using depressant and adjusting the proportion of oil to water. Depressant used for this purpose is NaCN. It selectively prevents ZnS from coming to the froth.