The temperature of the substance remains constant when it is melting and boiling though some quantity of heat is supplied. What happens to this energy?

It is dissipated as sound energy

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It is consumed to increase the energy of the molecules

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It is used to change the state of the substance

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It is still an unsolved problem in science

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Solution

The correct option is C It is used to change the state of the substance
The energy is used to change the state of the substance.
In Melting the solid state is changed to liquid state.
In boiling the energy is used to change from liquid state to gaseous state.

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Why does the temperature of a substance remains constant during melting and boiling even when heat is being supplied to it continuously .

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