Assertion :Decrease in the vapour pressure of water by adding $1$ mol of sucrose to one jg of water is higher to that produced by adding $1$ mol of urea to the same quantity of water at the same temperature. Reason: Molecular mass of sugar is less than that of urea.

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 D Both Assertion and Reason are incorrect
Liquid solutions is formed when we dissolve a solid, liquid or gas in a particular liquid solvent. Vapour pressure of liquid solutions is defined as the pressure exerted by the vapours on the liquid solvent when kept in equilibrium and a certain temperature.

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Assertion :Decrease in the vapour pressure of water by adding 1 mol of sucrose to one jg of water is higher to that produced by adding 1 mol of urea to the same quantity of water at the same temperature. Reason: Molecular mass of sugar is less than that of urea.

Assertion :Decrease in the vapour pressure of water by adding $1$ mol of sucrose to one jg of water is higher to that produced by adding $1$ mol of urea to the same quantity of water at the same temperature. Reason: Molecular mass of sugar is less than that of urea.