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A thermodynamic system is taken from an original state D to an intermediate state E by the linear process shown in the figure. Its volume is then reduced to the original volume from E to F by an isobaric process. The total work done by the gas from D to E to F will be

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-450 J

450 J

1350 J

900 J

answer is B.

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Detailed Solution

$\begin{array}{l} W_{DE} = \frac{1}{2} (600 + 300) 3 J \\ = 1350 J \\ W_{EF} = - 300 \times 3 = - 900 J \\ W_{DEF} = 450 J \end{array}$

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