Solutions and Colligative Properties 2 Question 22
22. The molecular weight of benzoic acid in benzene as determined by depression in freezing point method corresponds to
(a) ionisation of benzoic acid
$(1996,1 \mathrm{M})$
(b) dimerisation of benzoic acid
(c) trimerisation of benzoic acid
(d) solvation of benzoic acid
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Solution:
- In benzene, benzoic acid dimerises as :
$$ \mathrm{C}{6} \mathrm{H}{5} \mathrm{COOH} \rightleftharpoons \frac{1}{2}\left(\mathrm{C}{6} \mathrm{H}{5} \mathrm{COOH}\right)_{2} $$
