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During the melting of a slab of ice at 273 K at atmospheric pressure:

1. Internal energy of ice - water system remains unchanged
2. Internal energy of the ice - water system decreases
3. Positive work is done by the ice - water system on the a tmosphere
4. Positive work is done on the ice - water system by the atmosphere

Correct answer: Positive work is done on the ice - water system by the atmosphere

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