Assertion :Gold and silver are extracted from their native ores by leaching. Reason: Both silver and gold particles dissolve in dilute solution of sodium cynide in presence of oxygen.

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
Leaching is often used if the ore is soluble in some suitable solvent.
In the metallurgy of silver and gold, the respective metal is leached with a dilute solution of NaCN or KCN in the presence of air, which supplies $O_{2}$ . The metal is obtained later by replacement reaction.
Hence,both assertion and reason are correct and also reason is correct explanation for assertion.

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