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Assertion: Vapour pressure of solvent $A$ increases when a more volatile solvent $B$ is added.
Reason : $B$ is more volatile therefore vapour pressure of $B$ is greater than that of $A$.
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Reason : $B$ is more volatile therefore vapour pressure of $B$ is greater than that of $A$.
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The correct answer is:
If both assertion and reason are true and reason is the correct explanation of assertion.
Vapour pressure increases means the solvent $B$ is more volatile than $A$ and it has vapour pressure greater than that of $A$.
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