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Question

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

A
Solvent-solute interactions less than the solvent-solvent and the solute-solute interactions
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B
Solvent-solute interactions more than the solvent-solvent and the solute-solute interactions
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C
Solvent-solute interactions equal than the solvent-solvent and the solute-solute interactions
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D
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

PT>pAχA+pBχB

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
PT<pAχA+pBχB

An ideal soluton follows Raoult Law.
Here,
PT=pAχA+pBχB

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



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