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Question

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.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
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:

Psolvent=XsolventPosolvent

where:

Psolvent is the vapor pressure of the solvent above the solution,
Xsolvent is the mole fraction of the solvent in the solution, and
Posolvent is the vapor pressure of the pure solvent.


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