Q6 / 150 · MHT CET 2019 (Shift 1) · Chemistry

The elevation in boiling point of 2.25 mole aqueous solution of a substance is
$(K_{b} = 0.52 K k g m o l^{- 1})$

A
0.5 K
B
0.50 K
Correct answer
C
0.13 K
D
2.08 K

Solution

Key Idea Elevation in boiling is directly proportional to molal concentration of solute in a solution

Δ t_{2} \propto Δ T_{b} = K_{b} m

The elevation in boiling point

(Δ T_{b})

of 0.25 molal aqueous solution of a substance is

Δ T_{b} = K_{b} \times m = 0.52 \times 0.25 = 0.13 K

Hence, the correct answer is option: 'C'.

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