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  4. Benzoic acid undergoes dimerisation in benzene solution, the van't Hoff factor ' i ' is related to the degree of association ' x ' of the acid as

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Q. Benzoic acid undergoes dimerisation in benzene solution, the van't Hoff factor ' $i$ ' is related to the degree of association ' $x$ ' of the acid as

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Solution:

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Total $=1- x +\frac{ x }{2} =1-\frac{ x }{2} $
$ i =\frac{1- x / 2}{1} $
as $i =1-\frac{ x }{2} $