Question

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

• A. 0.01 M $N{a}_{2}S{O}_4$
• B. 0.015 M glucose
• C. 0.015 M urea
• D. 0.01 M $KN{O}_3$

Answer 1

Answer: (A)

Highest $b.pt\Rightarrow$ Maximum $\Delta$TB
$\Rightarrow$ Maximum number of particles (ions or molecules) per unit volume in solution.
(A) No. of particles in 0.01 M $N{a}_{2}S{O}_4=3\times 0.01$ M = 0.03 M
(B) No. of particles in 0.015 M glucose = 0.015 M
(C) No. of particles in 0.015 M urea = 0.015 M
(D) No. of particles in 0.01 M $KN{O}_3=0.01\times 2=0.02$ M
Thus, choice (A) is correct.