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Osmotic pressure observed when benzoic acid is dissolved in benzene is less than that expected from theoretical considerations. This is because
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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.
$\therefore$ Number of particles reduces $(i < 1)$ Hence, osmotic pressure observed is less than the theoretical consideration.
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