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

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Q. During the melting of a slab of ice at $273 \,K$ at atmospheric pressure

IIT JEEIIT JEE 1998Thermodynamics

Solution:

When a slab of ice at $ 273\,K $ melts, volume of water formed is less than the volume of ice melted ie, volume decreases. Therefore, work done by ice-water system is negative or in other words positive work is done by the atmosphere on the ice-water system. This increases the internal energy of ice-water system.