JEE Advanced 2025 · Paper 2 · Chemistry Q5

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ChemistryMultiple correct+4 / -2Question 37 of 48

The correct statement(s) about intermolecular forces is(are)

The potential energy between two point charges approaches zero more rapidly than the potential energy between a point dipole and a point charge as the distance between them approaches infinity.

The average potential energy of two rotating polar molecules that are separated by a distance

r

has

1/r^3

dependence.

The dipole-induced dipole average interaction energy is independent of temperature.

Nonpolar molecules attract one another even though neither has a permanent dipole moment.

Answer and worked solution

Official answer: C, D

(A) False. Charge-charge energy falls as $\frac1r$ and charge-dipole as $\frac1{r^2}$ . The charge-charge energy approaches zero more slowly.
(B) False. The orientation-averaged energy of two rotating dipoles (Keesom) varies as $\frac1{r^6}$ , not $\frac1{r^3}$ .
(C) True. Dipole-induced dipole (Debye) energy does not depend on thermal orientation, so it is independent of temperature.
(D) True. London dispersion forces arise from instantaneous dipoles, so nonpolar molecules still attract.

Topics:Liquid state Bond parameters and dipole moment

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JEE Advanced 2025 · Paper 2, Chemistry question 5