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  • Which of the following aqueous solution will exhibit highest boiling point?

Q.71) Which of the following aqueous solution will exhibit highest boiling point?
 

A)  $0.015 \mathrm{M} \mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6$
 

B) 0.01 M Urea
(3) $0.01 \mathrm{M} \mathrm{KNO}_3$
(4) $0.01 \mathrm{M} \mathrm{Na} \mathrm{Na}_4$

C) $0.01 \mathrm{M} \mathrm{KNO}_3$
 

D) $0.01 \mathrm{M} \mathrm{Na2} \mathrm{SO}_4$

 

Answers (1)

best_answer

 Boiling point elevation is a colligative property that depends on the amount of the substance. It depends on van't Hoff factor (i) $\times$ concentration-
- Glucose (non-electrolyte): $\mathrm{i}=1$
- Urea (non-electrolyte): $\mathrm{i}=1$
- $\mathrm{KNO}_3$ (strong electrolyte): $\mathrm{i}=2$ (1 K+ and one nitrate ion
- $\mathrm{Na}_2 \mathrm{SO}_4$ (strong electrolyte): $\mathrm{i}=3$ (3 Na+ ions and one sulphate ion)

Hence, the correct answer is option (4).

 

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