NTA Abhyas NEET2020ChemistryGeneral Principles and Processes of Isolation of MetalsPractice

How do we separate two sulphide ores by froth floatation method?

Options

ABy using excess of pine oil
BBy adjusting proportion of oil to water or using depressant
CBy using collectors and froth stabilisers like xanthates
DBy using some solvent in which one of the sulphides is soluble

Correct answer

B. By adjusting proportion of oil to water or using depressant

Step-by-step solution

Two sulphide orescan be seperated by adjusting the proportion of oil and water or by using depressants, e.g., if an ore contains ZnS and PbS both, a depressant NaCN is added duringfroth floatation. It forms a complex with ZnS and prevents it from coming into froth.

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