1.

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

Answer»

`i=(1-x)`
`i=(1+x)`
`i=(1-x//2)`
`1=(1+x//2)`

Solution :`{:(,2C_(6)H_(5)COOH,hArr,(C_(6)H_(5)COOH_(2))),("Before ASSO.","1 mol",,),("After asso.",1-x,,""(x)/(2)):}`
Total `=1-x+(x)/(2)=1-(x)/(2)`
`THEREFORE""i=(1-x//2)/(1)=1-(x)/(2)`.


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