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Assertion: In case of ores containing ZnS and PbS, NaCN is used as the depressant.
Reason: NaCN selectively prevents ZnS from coming to the froth but allows PbS to come with the froth.

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If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

If Assertion is correct but Reason is incorrect.

If both the Assertion and Reason are incorrect.

answer is A.

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Detailed Solution

Activators and depressants activate (or depress) the floating property of one of the components of the ore and thus help in the separation of different minerals present in the same ore.

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