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Question

When the solid changes into a liquid, there is no change in:

A
Temperature
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B
Average kinetic energy of the molecules
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C
Intermolecular force of attraction
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D
Average distance between the molecules
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Solution

The correct option is B Average kinetic energy of the molecules
When a solid changes into a liquid, there is no change in temperature, so the average kinetic energy of the molecules does not change as it is a function of temperature, but the distance between the molecules on average increases, whereas the intermolecular force of attraction decreases. Energy is required for increasing the separation between the attractive force between the molecules.


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