What happens when the temperature of a substance is increased?

Kinetic energy of the molecules of the substance increases.

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Kinetic energy of the molecules of the substance decreases.

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The amplitude of vibrations of molecules of the substance about their mean position decreases.

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It does not cause any change.

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Solution

The correct option is A
Kinetic energy of the molecules of the substance increases.

When the temperature of a substance is increased by heating, the kinetic energy of the molecules of the substance increases. The conduction of heat takes place when these molecules start vibrating with high energy and hence heat transfer from one molecule to another.

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