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  4. Benzoic acid is dissolved in benzene, van't Hoff factor will be:

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Q. Benzoic acid is dissolved in benzene, van't Hoff factor will be:

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Solution:

When benzoic acid dissolves in benzene it will be dimerised due to the inter molecular hydrogen bonding

$2 C _{6} H _{5} COOH \rightleftharpoons\left( C _{6} H _{5} COOH \right)_{2}$

Von't Hoff factor = $\frac{\text { number of particles after dissociation/association }}{\text { number of particles before dissociation / association }}=\frac{1}{2}$

$ = 0.5$