Question

For any substance why does the temperature remain constant during the change of state???

Answer 1

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→The temperature remains constant during the change of state because the heat supplied during the change is used up in overcoming the intermolecular forces between the particles of the state. 

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Answer 2

Hello friend! This is due to the latent heat ( heat used up in overcoming the interparticle force of attraction ).
Thus,the temperature remains constant