Assertion (A) : Vapour pressure of 0.5 M sugar solution is more than 0.5 M KCl solution (degree of ionization = 1)
Reason (R) : Lowering of vapour pressure is directly proportional to the number of particles present in the solution

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Both A and R are correct but R is not the correct explanation of A

Both A and R are correct and R is correct explanation of A

A is correct but R is not correct

A is not correct but R is correct

answer is B.

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Detailed Solution

$V P α \frac{1}{p a r t i c l e c o n e n t r a t i o n}$
Sugar solution = 0.5 M x 1 = 0.5
KCl solution = 0.5 x 2 = 1

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