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Solution: The amount of work done by the gas is greatest when the expansion is b) Isobaric
The P−V diagram for isobaric, isothermal and adiabatic process of an ideal gas is shown in graph below :
In thermodynamics, for same change in volume, the work done is maximum for the curve having maximum area enclosed with the volume axis. Area enclosed by the curve
∝ (Slope of curve)
Hence, work done is maximum in isobaric process.