An enclosed ideal gas is taken through a cycle as shown in the figure. Then
Diffcult
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For ideal gas, $P=n R T \frac{1}{V}$
Along $AB$, $P$ is constant and $\frac{1}{V}$ increases $\Longrightarrow T$ decreases
Along $BC,$ $P$ increases and $\frac{1}{V}$ remains constant $\Longrightarrow T$ increases
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