Assertion :The vapour pressure of $0.1 M$ sugar solution is more than that of $0.1 M K C l$ solution.
Reason: Relative lowering of vapour pressure is directly proportional to the number of species present in the solution.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
According to Raoults Law,
Relative lowering of vapour pressure is directly proportional to number of solute species present in solution i.e., vant hoff factor.
As $K C l$ ion dissociates $\Rightarrow$ more species $\Rightarrow$ more lowering $\Rightarrow$ Less vapour pressure.
So, assertion and reason both are correct and reason is correct explanation.

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