Question

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Answer 1

Answer:

To change state you need to overcome forces between the particles in the substance, and this needs energy. When heat is given to change the physical state of a substance, there is no rise in temperature of the substance. the heat energy which has to be supplied to change the state is latent heat.

Explanation:

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Answer 2

Answer:

During phase transitions, the heat supplied (called the latent heat) is fully utilised to change the state by overcoming the force of attraction between the particles. So, the temperature remains constant during the change of state.

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