Assertion :The vapour pressure of an aqueous solution of sucrose is less than $1.013$ bar at $373.15 K$ . Reason: Vapour pressure of water is $1.013$ bar at $373.15 K$ .

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The vapour pressure of an aqueous solution is less than 1.013 bar because of the relative lowering in vapour pressure by addition of solute molecules, with addition of solute molecules the surface area decreases and vapour pressure decreases.

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Assertion :The vapour pressure of an aqueous solution of sucrose is less than 1.013 bar at 373.15K. Reason: Vapour pressure of water is 1.013 bar at 373.15K.

Assertion :The vapour pressure of an aqueous solution of sucrose is less than $1.013$ bar at $373.15 K$ . Reason: Vapour pressure of water is $1.013$ bar at $373.15 K$ .