In the $P-V$ diagram, $I$ is the initial state and $F$ is the final state. The gas goes from $I$ to $F$ by $(i)\,IAF,\,\,(ii)\,IBF,\,\,(iii) ICF$. The heat absorbed by the gas is
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Heat absrobed in a thermodynamic process is given by
$\Delta \mathrm{Q}=\Delta \mathrm{U}+\Delta \mathrm{W}$
Here, $\Delta \mathrm{U}$ is same for all the three processes as it depends only on initial and final states.
$\text { But } \quad \Delta \mathrm{W}_{1}=+\mathrm{ve}, \Delta \mathrm{W}_{\mathrm{II}}=0$
${\text { and }} {\Delta \mathrm{W}_{\mathrm{III}}=-\mathrm{ve}} $
${\text { or }} {\Delta \mathrm{Q}_{1}>\Delta \mathrm{Q}_{\mathrm{II}}}$
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