Which of the following statements is correct regarding liquid vapour equilibrium state at a given temperature?

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The number of molecules leaving the liquid equals the number returning to liquid from the vapour

The number of molecules leaving the liquid is not equal the number returning to liquid from the vapour

The number of molecules leaving the liquid is less than the number returning to liquid from the vapour

The number of molecules leaving the liquid is more than the number returning to liquid from the vapour

answer is A.

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Detailed Solution

A system gives rise to a constant vapour pressure because of an equilibrium in which the number of molecules leaving the liquid equals the number returning to liquid from the vapour. We say that the system has reached equilibrium state at that temperature.

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