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Question

Molecules at the surface of solid have .............. energy than molecules those inside:

A
Higher
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B
Lower
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C
Some times higher and some times lower
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D
None
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Solution

The correct option is A Higher
At the surface, a molecule is on one side surrounded by molecules of the same type and on the other side of another type. Therefore the net interaction force is no longer zero. So molecules at the surface of the solid have more energy than the molecules inside the solid.

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