Solutions and Colligative Properties - Result Question 22-1
22. The molecular weight of benzoic acid in benzene as determined by depression in freezing point method corresponds to
(1996, 1M)
(a) ionisation of benzoic acid
(b) dimerisation of benzoic acid
(c) trimerisation of benzoic acid
(d) solvation of benzoic acid
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Answer:
Correct Answer: 22. (b)
Solution: In benzene, benzoic acid dimerises as :
$ \mathrm{C}_6 \mathrm{H}_5 \mathrm{COOH} \rightleftharpoons \frac{1}{2}\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{COOH}\right)_2 $
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