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Question: Answered & Verified by Expert
Osmotic pressure observed when benzoic acid is dissolved in benzene is less than that expected from theoretical considerations. This is because
ChemistrySolutionsCOMEDKCOMEDK 2018
Options:
  • A benzoic acid is an organic solute
  • B benzoic acid has higher molar mass than benzene
  • C benzoic acid gets associated in benzene
  • D benzoic acid gets dissociated in benzene
Solution:
2417 Upvotes Verified Answer
The correct answer is: benzoic acid gets associated in benzene
Osmotic pressure is a colligative property. It depends upon the number of solute particles. Benzoic acid undergoes dimerisation.
$\therefore$ Number of particles reduces $(i < 1)$ Hence, osmotic pressure observed is less than the theoretical consideration.

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