Question

Take “r” as the distance between two molecules. The energy between stationary polar molecules is proportional to ____________   in the case of dipole-dipole intercations.

(a) 1/r^3

(b) r^3

(c) r^2

(d) 1/r^2

This question was addressed to me in an online quiz.

Origin of the question is States of Matter topic in division States of Matter of Chemistry – Class 11

Answer 1

The correct choice is (a) 1/r^3

The best explanation: The energy between two polar molecules which are stationary, is inversely proportional to the cube of the distance between the molecules, in the case of dipole-dipole intercations. This interaction is stronger than the London forces.