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

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

A
$001 M {Na}_{2} {SO}_{4}$
B
$0.01 M {KNO}_{3}$
C
$0.015 M urea$
D
$0.015 M glucose$

Solution:

Larger the number of species in solution, larger the boiling point. $001 M {Na}_{2} {SO}_{4}$ solution has 0.03 M of species

$(= 0.02 M {Na}^{+} + 0.01 M {SO}_{4}^{2 -})$ .

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