One mole of an ideal gas goes from an initial state $A$ to final state $B$ via two processes : It first undergoes isothermal expansion from volume $V$ to $3\, V$ and then its volume is reduced from $3\, V$ to $V$ at constant pressure. The correct $P-V$ diagram representing the two processes is
AIPMT 2012, Medium
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According to the question,first gas goes from volume $V$ to $3V$ and after this volume is reduced from $3V$ to $V$ at constant pressure.In the isothermal Expansio, the $P-V$ curve is a rectangular hyperbola.
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