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Intermolecular Forces

The interacti...

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

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Solution

Answer: (c) polarisability of interacting particles

London dispersion forces operate only over very shrot distance. The energy of interaction varies as $\frac{1}{(d i s t a n c e b e t w e e n t w o i n t e r a c t i n g p a r t i c l e s)^{6}}$

Large or more complex are the molecules, greater is the magnitude of London forces. This is obviously due to the fact that the large electron clouds are easily distorted or polarised.

Hence, greater the polarisability of the interacting particles, greater is the magnitude of the interaction energy.

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