Heat is ____ when a substance changes its state from liquid to solid and heat is _ when a substance changes its state from liquid to vapour.

released, released

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absorbed, absorbed

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released, absorbed

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absorbed, released

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Solution

The correct option is C released, absorbed
In the process of freezing, a substance changes its state from liquid to solid during which the heat is released by the liquid at constant temperature.
However in the process of boiling, a substance changes its state from liquid to vapour during which heat is absorbed by the liquid at constant temperature.

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