Q. 11

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Answer :

Given, mass of solute i.e. benzoic acid, W2 = 3.9 g

Molar mass of solute, M2 = 122 g

Mass of solvent i.e. benzene, W1 = 49 g

Depression in freezing point, ΔTf = 1.62 K

We know, ΔTf = i where i = Vant Hoff factor

i =

i = 0.045

Since, the value of i<1, it shows molecular association.

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