SSC
CHEMISTRY
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following phase changes is exothermic?
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melting
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freezing
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vaporization (evaporation)
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sublimation
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Explanation:
Detailed explanation-1: -1-freezing, condensation, and deposition, which are the reverse of fusion, sublimation, and vaporization-are exothermic.
Detailed explanation-2: -When water becomes a solid, it releases heat, warming up its surroundings. This makes freezing an exothermic reaction.
Detailed explanation-3: -Freezing is a phase transition where a liquid turns into a solid when its temperature is lowered below its freezing point. In accordance with the internationally established definition, freezing means the solidification phase change of a liquid or the liquid content of a substance, usually due to cooling.
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