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12. An ideal gas is taken through the cycle A→ B → C → A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C → A is

(a)      – 5 J

(b)  – 10 J

(c)   – 15 J

(d)  – 20 J

Answer-a

(118)

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