Question

The interaction energy of London force is
inversely proportional to sixth power of the
distance between two interacting particles but
their magnitude depends upon
(a) charge of interacting particles
(b) mass of interacting particles
(c) polarisability of interacting particles
(d) strength of permanent dipoles in the
particles.

Answer 1

Answer:

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Answer 2

The interaction energy of London force is inversely proportional to sixth power of the distance between the two interacting particles, and their magnitude depends on (c) polarisability of interacting particles.

Explanation:

What is more important here is to understand one basic fact about London force.

• This force comes into existence only if the distances are very short.

But the energy of the LDF may vary as it is inversely proportional to the sixth power of the distances that exists between the interacting particles.

So the magnitude will change or increase if the molecules are complex in structure. This is because of the fact that electron clouds that are complex or large are usually easy to polarize or distort. This also increases the polarisability of the particles that are interacting.

Thus if polarisability increases then the magnitude also increases. Thus option C is the right answer.