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Question

Intermolecular hydrogen bonding increases the enthalpy of vapourization of a liquid due to

A

decrease in the attraction between molecules

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B

increase in the attraction between molecules

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C

decrease in the molar mass of unassociated liquid molecules.

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D

Increase in the effective molar mass of Hydrogen-bonded molecules.

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Solution

The correct options are
B

increase in the attraction between molecules


D

Increase in the effective molar mass of Hydrogen-bonded molecules.


H-bonding improves attraction between molecules.

Thus, effective molar mass of the molecule increases.

In effect, boiling point increases.

So, option B and D are correct effects of H-bonding.

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