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The freezing point of benzene decreases by 0.45°C when 0.2 g of acetic acid is added to 20 g of benzene. If acetic acid associates to form a dimer in benzene, percentage association of acetic acid in benzene will be (K f for benzene = 5.12 K kg mol –1 )

1. 74.6%
2. 94.6%
3. 64.6%
4. 80.4% Students may find similar question in CP exercise sheet : [ JEE Main, Chapter : Solution, Solved Example Q. No.40 ] [ JEE Advance, Chapter : Solution, Exercise-5, Section [B], Q. No.2 ]

Correct answer: 94.6%

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