Q118 / 200 · NEET 2012 (Screening) · Physics
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
- A

- B

- C

- Correct answerD

Solution
According to question first gas goes from volume $V$ to $3 V$ and after this volume is reduced from $3 V$ to $V$ at constant pressure. In isothermal expansion $p-V$ curve is rectangular hyperbola.
Option (4) is correct
Hence, the correct answer is option: 'D'.