Chemistry - Thermodynamics - II Question with Solution | TestHub

In the given P–V diagram, AB and CD are horizontal, so they represent isobaric processes (constant pressure).

For an ideal gas, $PV=nRT$. At constant pressure, $V\propto T$, so these processes appear as sloping straight lines on a V–T graph.

Segments BC and DA are vertical in the P–V diagram, indicating isochoric processes (constant volume).

In a V–T graph, constant-volume processes are represented by horizontal lines.

Matching the sequence A → B → C → D → A with these conditions gives the diagram shown in Option (C).