The mixture which shows positive deviation from Raoult’s law is:

Benzene + Toluene

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Chloroethane + Bromoethane

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Ethanol + Acetone

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Acetone + Chloroform

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Solution

The correct option is C Ethanol + Acetone
Acetone + ethanol shows positive deviation from Raoult’s law. Pure ethanol possesses H-bonding and adding acetone to ethanol causes breaking of some H-bonds.
This causes increase in observed vapour pressure.

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

35^{\circ} C

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