Sometimes it is possible to separate two sulphide ores by a…

Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) General Single Correct MCQ

Published on: August 13, 2026

Sometimes it is possible to separate two sulphide ores by adjusting the proportion of oil to water or by using depressants. When a depressant NaCN is added to an ore containing ZnS and PbS, what is the correct observation?

NaCN prevents PbS from coming to the froth but allows ZnS to come with froth.

NaCN prevents ZnS from coming to the froth but allows PbS to come with froth

NaCN prevents frothing of both ZnS and PbS, hence no froth is formed.

NaCN does not act as depressant hence a mixture of PbS and ZnS is found in froth.

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The correct answer is:

: NaCN acts as a depressant it selectively prevents ZnS from coming to froth by forming a complex but allows PbS to come with froth.

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