In an isothermal process the volume of an ideal gas is halved. One can say that

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Internal energy of the system decreases

Work done by the gas is positive

Work done by the gas is negative

Internal energy of the system increases

answer is C.

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Detailed Solution

For isothermal processdU=0 and work done =dW=PV2−V1∵V2=V12=V2∴dW=−PV2

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