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VITEEE 2025 Paper

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Question : 53 of 125

Marks: +1, -0

Vapour pressure of solution containing 2 mol of liquid

A

P_{A}^{o}=80

torr ) and 3 mol of liquid

B

P_{B}^{o}=100

torr ) is 87 torr. We can conclude that

there is negative deviation from Raoult's law
boiling point is higher than that expected for ideal solution
molecular attractions between unlike molecules are stronger than those between like molecules
All of these statements are correct

Solution:

For ideal solution vapour pressure of solution

\;=P_A^{\circ} X_A+P_B^{\circ} X_B

\;=80 \times \;\frac{2}{5}+100 \times \;\frac{3}{5}=92 \;\text{ torr }\;

Since observed vapour pressure of solution < ideal vapour pressure, the solution shows negative deviation.

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