A substance on heating, undergoes a change in its phase without any change in its temperature. Then which of the following is/are correct :

Average potential energy of the molecule will increase

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Potential energy of the substance will remain constant

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Average Potential energy will decrease

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None of these

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Solution

The correct option is A Average potential energy of the molecule will increase
Latent heat supplied is used up in increasing the potential energy of molecules ,heat is utilized in doing work against the force of attraction of molecules.

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A substance on heating, undergoes (i) a rise in its temperature, (ii) a change in its phase without change in its temperature. In each case, state the change in energy of molecules of the substance.

Q. How does the average kinetic energy of the molecules of a substance changes during its change in phase at a constant temperature, on heating?

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A substance on heating, undergoes a change in its phase without any change in its temperature. Then which of the following is/are correct :

The correct option is A Average potential energy of the molecule will increaseLatent heat supplied is used up in increasing the potential energy of molecules ,heat is utilized in doing work against the force of attraction of molecules.

The correct option is A Average potential energy of the molecule will increase
Latent heat supplied is used up in increasing the potential energy of molecules ,heat is utilized in doing work against the force of attraction of molecules.