Equimolal solutions in the same solvent have:

same elevation in boiling point and same depression in freezing point

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different elevation in boiling point and different depression in freezing point

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same elevation in boiling point but different depression in freezing point

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same depression in freezing point but different elevation in boiling point

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Solution

The correct option is A same elevation in boiling point and same depression in freezing point
Equimolal solutions in the same solvent have the same elevation in boiling point and same depression in freezing point.

${Δ T}_{b} \propto$ molality { since molality of solutions are same so ${Δ T}_{b}$ and ${Δ T}_{f}$ for both solution will be same.

${Δ T}_{f} \propto$ molality

${Δ T}_{b} =$ elevation in boiling point
${Δ T}_{f} =$ Depression in freezing point

Colligative properties depend only on no. of solute particles and not on natural or identity of solute particles.

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Question 31
Isotonic solutions must have the same .......... .
(a) solute (b) density
(c) elevation in boiling point (d) depression in freezing point

N a C l

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