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if yous answer is options 1,3,4 then you have to fill the Answer as ‘134’
If your answer is options 2, 4 then you have to fill the answer as '24'
During the melting of a slab of ice at 273 K at atmospheric pressure
1) Positive work is done by the ice-water system
2) negative work is done by the ice-water system
3) The internal energy of the ice water increases
4) The internal energy of the water system remains constant

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answer is 23.

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Detailed Solution

There is a decrease in volume during melting on an ice slab at 273K. Therefore, negative work is done by ice-water system on the atmosphere or positive work is done on the ice-water system by the atmosphere.

heat is absorbed during melting (i.e., △Q = positive) and as we have seen, work done by ice-water system is negative (△W = negative).

△U=△Q−△W

so, △U is positive.

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