Question

Assertion : A non volatile solute is mixed in a solution then elevation in boiling point and depression in freezing point both are 2 K. 

Reason : Elevation in boiling point and depression in freezing point both depend on melting point of non-volatile solute.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

Correct option (d) A and R are false

Explanation:

Elevation in boiling point (ΔT_b) = K_b x m

Depression in freezing point (ΔT_f) =  K_f x m

Elevation in boiling point and depression in freezing point are colligative properties i.e., they depend only on the number of particles of the solute. Value of K_b and K_f are different, so ΔT_b and ΔT_f are also different.