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JEE Main levelOne or more correct optionsDifficulty 2 of 3so101

Which of the following solutions has a van't Hoff factor $i$ greater than $1$ ? (Consider dilute solutions in the solvent stated.)

ABenzoic acid in benzene (dimerises)
BSucrose in water
C $HCl$ in water
D $CH X_{3} COOH$ in water (partial ionisation)

Answer: C, D

A factor

i > 1

needs more particles in solution than formula units dissolved.

HCl

ionises completely and acetic acid ionises partly in water, so both exceed

1

. Benzoic acid in benzene dimerises, giving

i < 1

, and sucrose neither dissociates nor associates, so

i = 1

.

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