Sometimes it is possible to separate two sulphide ores by adjusting th – InterviewSolution

1.	Sometimes it is possible to separate two sulphide ores by adjusting the proportion of oil to water or by using depressant NaCN is added to an ore conaining ZnS and PbS, what is the correct observation?
Answer» 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 Answer :B

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