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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
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B
mass of interacting particles
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C
polarisability of interacting particles
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D
strength of permanent dipoles in the particles
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Solution

The correct option is D polarisability of interacting particles
C. London dispersion forces operate only over a very short distance. The energy of interaction varies as inversely proportional to distance between two interacting particles to the power of 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 polwised. Hence, greater the polarisability of interacting particles. Greater is the magnitude of interaction energy.

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