Question Details

Intermolecular forces decrease rapidly as the distance between the molecules increases and do so much more

Options

A

Slowly than demanded by the inverse square law of the distance

B

Rapidly than anticipated through the inverse square law of the distance

C

According to inverse square law

D

It actually remains the same for all the distances

Correct Answer :

Rapidly than anticipated through the inverse square law of the distance

Solution :

The correct option is: Rapidly than anticipated through the inverse square law of the distance

Step-by-Step Explanation:

Intermolecular forces are the forces of attraction or repulsion that act between neighboring particles (atoms, molecules, or ions). Unlike macro-scale forces, these forces are short-range interactions that are highly dependent on the distance between the particles.

Fundamental forces like gravity and electrostatics follow the inverse square law. According to this law, the force (F) is inversely proportional to the square of the distance (r) between the centers of the two interacting bodies:
F1r2
Under this law, if the distance is doubled, the force decreases to one-quarter (2-2) of its original strength.

In contrast, intermolecular forces (such as London dispersion forces, which are a type of van der Waals force) decrease much more steeply. For instance, the potential energy of dispersion forces typically varies inversely with the sixth power of distance, meaning the force itself varies inversely with the seventh power of the distance:
F1r7
Because the power of the distance is much higher than 2, a small increase in distance causes the intermolecular force to drop to a negligible value almost instantly. Thus, intermolecular forces decrease far more rapidly than what is anticipated by the inverse square law.

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