Liquids that show positive deviation from Raoult's law will have:

Solvent-solute interactions less than the solvent-solvent and the solute-solute interactions

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Solvent-solute interactions more than the solvent-solvent and the solute-solute interactions

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Solvent-solute interactions equal than the solvent-solvent and the solute-solute interactions

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Comparison between solvent-solute interactions and solvent-solvent interactions cannot be made.

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Solution

The correct option is A Solvent-solute interactions less than the solvent-solvent and the solute-solute interactions
Liquids showing positive deviation will have total vapour pressure more than what it should be according to Raoult's Law This is because, solvent-solute interaction is less than the solvent-solvent and the solute-solute interactions

$P_{T} > p_{A}^{\circ} χ_{A} + p_{B}^{\circ} χ_{B}$

Liquids showing negative deviation will have total vapour pressure less than what it should be according to Raoult's Law. This is because solvent-solute interaction is more than the solvent-solvent and the solute-solute interactions
$P_{T} < p_{A}^{\circ} χ_{A} + p_{B}^{\circ} χ_{B}$

An ideal soluton follows Raoult Law.
Here,
$P_{T} = p_{A}^{\circ} χ_{A} + p_{B}^{\circ} χ_{B}$

Here , solvent-solute interaction is equal to the solvent-solvent and the solute-solute interactions.

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Which of the following liquid pairs shows a positive deviation from Raoults law?

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