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Abnormal Colligative Properties

Acetic acid d...

Question

Acetic acid dissolved in benzene shows a molecular weight of:

A

60

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B

120

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C

180

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D

240

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Solution

The correct option is B 120
Acetic acid (molar mass 60 g/mol) dimerises in benzene due to presence of hydrogen bonding between its molecule hence the molecular weight becomes double than that of normal value.
Hence, in benzene acetic acid show molecular weight of 120 g/mol

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Benzoic acid dissolved in benzene will show a molecular weight of

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Acetic acid undergoes dimerisation, when dissolved in benzene (as shown in figure)
Molecular mass of acetic acid is found to be

120

Which among the following relation is correct?

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d

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