During phase change,entropy

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(D) The entropy of a system during a phase change (phase transition) is determined by the heat exchange involved. Entropy change is given by $\Delta S

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may increase or decrease

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(D) The entropy of a system during a phase change (phase transition) is determined by the heat exchange involved. Entropy change is given by $\Delta S = \frac{Q}{T}$,where $Q$ is the heat exchanged and $T$ is the absolute temperature. During melting or vaporization,heat is absorbed by the system $(Q > 0)$,so entropy increases. During freezing or condensation,heat is released by the system $(Q Therefore,during a phase change,the entropy of the system may increase or decrease depending on the direction of the transition.

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