Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
During the melting of slab of ice at 273 K at atmospheric pressure: (1) positive work is done by the ice-water system on the atmosphere (2) positive work is done on the ice-water system by the atmosphere (3) the internal energy of the ice-water system increases (4) the internal energy of the ice-water system decreasesA) 1 and 2 are correct
B) 2 and 3 are correct
C) 1 and 4 are correct
D) 1, 2 and 3 are correct
Correct Answer: B
Solution :
There is a decrease in volume during melting on an ice slab at 273 K. Therefore, negative work is done by the 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., \[dQ,\]is positive) and as we have seen, work done by ice-water system is negative (\[dW\]is negative) Therefore, from first law of thermodynamics \[dU=dQ-dW\] Change in internal energy of ice-water system du will be positive or internal energy will increase.
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