Assertion : Molecular mass of KCl calculated on the basis of colligative properties will be lower than the normal molecular mass.
Reason : Experimentally determined molar mass is always lower than the true value. a)If both (A) and (R) are correct and (R) is the correct explanation of(A). b)If both (A) and (R) are correct, but (R) is not the correct explanation of (A). c)If (A) is correct, but (R) is incorrect. d)If both (A) and (R) are incorrect.

Options

A. If both (A) and (R) are correct and (R) is the correct explanation of(A).
B. If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
C. If (A) is correct, but (R) is incorrect.
D. If both (A) and (R) are incorrect.

Answer

C

Explanation

KCl undergoes dissociation in solution, hence observed molar mass will be lower. Experimentally determined molar mass can be higher or lower depending upon whether solute undergoes dissociation or association.