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14. During the adiabatic expansion of 2 moles of a gas, the internal energy of the gas is found to decrease by 2 joules, the work done during the process on the gas will be equal to

(a)  1 J                                       (b)   -1  J

(c)   2 J                                       (d)  – 2 J

Answer-d

(4)

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