Assertion :Addition of a non-volatile lowers the vapour pressure of solvent. Reason: Vapour pressure of a solution is directly proportional to mole fraction of solvent.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Option (A) is correct.
The vapour pressure of the solvent above a solution containing a non-volatile solute (i.e., a solute that does not have a vapor pressure of its own) is directly proportional to the mole fraction of solvent in the solution. This behavior is summed up in Raoult's Law:
$P_{s o l v e n t} = X_{s o l v e n t} P_{s o l v e n t}^{o}$
where:
$P_{s o l v e n t}$ is the vapor pressure of the solvent above the solution,
$X_{s o l v e n t}$ is the mole fraction of the solvent in the solution, and
$P_{s o l v e n t}^{o}$ is the vapor pressure of the pure solvent.

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