Question

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

A
Positive work is done by the ice-water system on the atmosphere
B
Positive work is done on the ice-water system by the atmosphere
C
The internal energy of ice-water system increases
D
The internal energy of the ice-water system decreases

Solution

## The correct options are A Positive work is done on the ice-water system by the atmosphere B The internal energy of the ice-water system decreasesIn melting Ice to water , heat $$Q$$ is supplied by air $$[Q > 0]$$ Ice is less dense than water , so when ice melts, its intermolecular distances decreases resulting in lowering of internal energy [ $$\Delta$$u < 0] Thus, as $$W=Q-\Delta u$$, from above , $$\Rightarrow$$ work done by air is positive. Physics

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