Assertion :Desilverisation of lead is done by Parkes method. Reason: When lead-silver alloy is poor in silver, zinc is added to molten ore.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Parkes process of desilverizing lead in which zinc is added to the molten lead and the silver and gold are absorbed in an alloy of zinc. As $A g$ is more (3000 times) miscible in molten zinc than in molten $P b$ . Also, the Zn metal is added because it is immiscible in lead.
Both Assertion and Reason are correct statements but the reason explains assertion.
Option A is correct.

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