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Sometimes, it is possible to separate two sulphide ores by adjusting proportion of oil to water or by using depressants. In case of an ore containning Zns and PbS, the depressant used is :

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${CuSO}_{4}$

$NaCN$

${Na}_{2} S$

none of these

answer is B.

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Detailed Solution

Sometimes, it is possible to separate two supplied

ores by adjusting the proportion of oil to water or by using depressants.

In the case of an ore containing ZnS and PbS, the depressant used is NaCN.

Gangue is removed from supplied ores using the foam flotation process. Water is used in this procedure to create a suspension of the powdered ore.

By changing the oil to water ratio or by utilizing "depressants," it is feasible to separate two supplied ores.

NaCN is the depressant in the case of an ore containing ZnS and PbS. While allowing PbS to arrive with the froth, it selectively prohibits ZnS from doing so.

Hence, option B is correct.

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