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Q.

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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a

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

b

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

c

A is correct but R is not correct

d

A is not correct but R is correct

answer is B.

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Detailed Solution

VPα1particle   conentration
Sugar solution = 0.5 M x 1 = 0.5
KCl solution = 0.5 x 2 = 1
 

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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