Consider the reversible processes for 1.0 mol of an ideal gas as shown in the figure. w 1 , w 2 , w 3 and w 4 represent work done (in calories) in the processes 1, 2, 3 and 4, respectively; U 2 and U 4 are changes in the internal energy for the processes 2 and 4, respectively. [use R = 2 cal K -1 mol -1 ] The correct option is

1. A. w 1 + w 3 = -2T 1 V 2 V 1 - 2T 2 V 4 V 3
2. B. w 2 + w 4 = U 2 - U 4
3. C. w 1 + w 2 = 2T 1 V 2 V 1
4. D. w 1 + w 2 + w 3 + w 4 = 0

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