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Q.

A gas undergoes a change of state during which 100J of heat is supplied to it and it does 20J of work. The system is brought back to its original state through a process during which 20J of heat is released by the gas. The work done by the gas in the second process is

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a

40J

b

60J

c

80J

d

20J

answer is A.

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Detailed Solution

In a cyclic process Heat absorbed =work done 
Q1+Q2=W1+W2 100-20=20+W2 W2=60J

 

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