Assertion :Silica gel is used to dry air. Reason: Silica gel absorbs moisture from air.

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.
The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid is termed adsorption.
The air becomes dry in the presence of silica gel because the water molecules get adsorbed on the surface of the gel.
Hence, both assertion and reason are correct and the reason being that the silica gel adsorbs moisture from the air is the correct explanation for the assertion.

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