MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistrySolutionsIdeal and non-ideal solution

A solution of acetone in ethanol

A.shows a negative deviation from Raoult’s law.

B.shows a positive deviation from Raoult’s law.✓ Correct

C.behave like a near ideal solution

D.obeys Raoult’s law.

Explanation

A solution of acetone in ethanol shows positive deviation from Raoult’s law because of the miscibility of these liquids with the difference of polarity. The acetone reduces the H-bonding strength between the ethanol molecules. Therefore, the mixture has a greater rate of evaporation and has a lower boiling point. It exhibits a positive deviation from Raoult’s law. SOLUTIONS 37 Therefore, the mixture has weaker intermolecular forces than the pure liquids.

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