JEE Main · 2004 · 24 Apr 2004 · Offline · Solutions

Which one of the following aqueous solutions will exhibit highest boiling point?

(A) $0.01 M Na_{2} SO_{4}$ ✓ Correct
(B)0.015 M glucose
(C)0.015 M urea
(D) $0.01 M KNO_{3}$

Answer: (A)

Solution

Boiling-point elevation follows

Δ T_{b} = i K_{b} m

, so the solution with the largest product of van't Hoff factor and concentration wins.

Na X_{2} SO X_{4}

breaks into three ions, giving

i = 3

and an effective

0.01 \times 3 = 0.03

KNO X_{3}

gives two ions, so

i = 2

and

0.01 \times 2 = 0.02

. Glucose and urea stay molecular at

i = 1

, each

0.015

. The sodium sulphate solution carries the highest effective particle concentration and so shows the highest boiling point.

JEE Main · 2004 · 24 Apr 2004 · Offline · Single correct option

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