The interval during which the substance is changing from the liquid phase to the gas phase is.

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Solution

The correct option is D CD
The temperature does not change during a phase change, since the heat is used to change the state of the substance and not its temperature. Since the substance is in the solid state at $20^{o} C$ , it is changing from a solid to a liquid during interval AB and a liquid to a gas during the interval CD.

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