Which of the following aqueous solution will exhibit highest boiling point? [2025]

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Solution

Q.
Which of the following aqueous solution will exhibit highest boiling point [2025]

1 0.01 M ${Na}_{2} {SO}_{4}$

2 0.015 M $C_{6} H_{12} O_{6}$

3 0.01 M urea

4 0.01 M ${KNO}_{3}$

Ans.
(1)

Elevation in boiling point, $Δ T_{b} = m \times i \times K_{b}$

or $Δ T_{b} \propto m \times i$ (As, $K_{b}$ is constant)

or $Δ T_{b} \propto concentration \times no. of ions$

For 0.01 M ${Na}_{2} {SO}_{4}$ , $Δ T_{b} = 0.01 \times 3 K_{b} = 0.03 K_{b}$

For 0.015 M $C_{6} H_{12} O_{6}$ , $Δ T_{b} = 0.015 \times 1 \times K_{b} = 0.015 K_{b}$

For 0.01 M urea, $Δ T_{b} = 0.01 \times 1 \times K_{b} = 0.01 K_{b}$

For 0.01 M ${KNO}_{3}$ , $Δ T_{b} = 0.01 \times 2$ $K_{b} = 0.02 K_{b}$

Thus, 0.01 M ${Na}_{2} {SO}_{4}$ solution will exhibit highest boiling point.

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