The correct statement(s) about intermolecular forces is(are)
(A)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.
(B)The average potential energy of two rotating polar molecules that are separated by a distance r has dependence.
(C)The dipole-induced dipole average interaction energy is independent of temperature.Correct
(D)Nonpolar molecules attract one another even though neither has a permanent dipole moment.Correct
Answer: (C),(D)
Solution
(A) Charge–charge energy falls as 1/r, charge–dipole as 1/r², so the charge–charge energy approaches zero more slowly: false. (B) For freely rotating polar molecules the thermally averaged (Keesom) energy varies as , not : false. (C) The
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