What does the corresponding PV diagram look like?

$\begin{array}{1 1} a \\ b \\ c \\ d\end{array}$

For an ideal gas, PV = nRT.

From A to B, process is isochoric with increase in pressure and temperatures.

From B to C, process is isobaric with increasing volume. (Because $T = \large \frac {P}{nR} $$V$, the graph is of the type $y = mx + c$ with slope $m$)

Process C to D is isochoric with decreasing temperature and pressure.

Process D to A is isobaris but with lesser slope and hence lesser pressure.

Hence the PV diagram looks like:

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