Which of the following processes necessarily occur at a constant temperature?

Melting

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Evaporation

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Freezing

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Boiling

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Solution

The correct options are
A Melting
C Freezing
D Boiling
The processes of boiling, freezing and melting do not involve a change in the temperature. This is because during the change of state, the heat is absorbed/released in the form of latent heat which causes the change of state. So, no temperature change occurs.

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