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Why does ethanoic acid in benzene show a molar mass about twice the normal value?
AIt splits into ions
BIt forms H-bonded dimers
CIt reacts with benzene
DIt evaporates away
Answer & Solution
Correct answer: B. It forms H-bonded dimers
Dimerisation halves the number of particles, so the colligative effect is halved and the calculated molar mass doubles.
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