JEE Main 2017 — Solutions Question with Solution
From: JEE Main 2017 (Offline)
Question
The freezing point of benzene decreases by 0.450C when 0.2 g of acetic acid is added to 20g of benzene. If
acetic acid associates to form a dimer in benzene, percentage association of acetic acid in benzene will be:
(Kf for benzene = 5.12 K kg mol–1)
Choose an option
Show full solutionCorrect option: C
Correct answer
C94.6 %
Step-by-step explanation
Tf = i Kf m
0.45 = i 5.12
i = 0.527
2CH3COOH ⇌ (CH3COOH)2
1 -
i = 1 - +
= 0.946
% dissociation is 94.6%.
0.45 = i 5.12
i = 0.527
2CH3COOH ⇌ (CH3COOH)2
1 -
i = 1 - +
= 0.946
% dissociation is 94.6%.
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