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