Assertion :Meniscus of a liquid disappears at critical temperature. Reason: Density of a liquid and its gaseous phase become equal at the critical temperature.

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
At critical temperature, it is not possible to state whether the substance is in the gaseous form or in the liquid form. In fact, both the states become indistinguishable at critical point.

Meniscus is the curve in the upper surface of a liquid as shown in the given figure. The surface of separation between liquid and gas disappears. At this point, the various physical properties such as density, refractive index etc., have identical values for the states.

Option A is correct.

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