MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistrySolutionsPrevious Year Questions

The mixture which shows positive deviation from Raoult’s law is: (NEET 2020)

A.Acetone + Chloroform

B.Chloroethane + Bromoethane

C.Ethanol + Acetone✓ Correct

D.Benzene + Toluene

Explanation

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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