Assertion :At critical temperature, surface tension of liquid becomes zero. Reason: At this temperature, intermolecular forces for liquids and gases become equal. Liquid can expand without any restriction.

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 surface temperature in a fluid arises as a result of uneven forces between liquid molecules and the surrounding gas molecules. At the critical temperature, these forces become equal and therefore, the value of surface tension becomes 0

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