A) Positive work is done by ice-water system on the atmosphere
B) Positive work is done on the ice-water system by the atmosphere
C) The internal energy of the ice-water system increases
D) The internal energy of the ice-water system decreases
Correct Answer: B
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. Secondly heat is absorbed during melting (i.e.\[\Delta Q\] is positive) and as we have seen, work done by ice-water system is negative (\[\Delta W\] is negative). Therefore, from first law of thermodynamics \[\Delta U=\Delta Q-\Delta W.\]
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