An ideal gas follows a process $PT =$ constant. The correct graph between pressure $\&$ volume is
Diffcult
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$P T=$ constant
From ideal gas equation
$P V=n R T$
$T=\frac{P V}{n R}$
Put value of temperature in above equation. $P T=$ constant $P \frac{P V}{n R}=$ constant
$P^{2}=\frac{\text { constant }}{V}$
$P \propto \frac{1}{\sqrt{V}}$
Hence, the graph will be rectangular hyperbola.
Thus option $\mathrm{C}$ is correct.
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