Question

The graph that does not represent the behaviour of an ideal gas is

• A.
• B.
• C.
• D.

Answer 1

Answer: (B), (C)

$pV=nRT$
$p=\frac{RT}{V}($ for $1$ mole $)$
At constant $T,p$ would be inversely proportional to $V$.
So, plot of $p$ versus $V$ would

Thus, plot (a) is correct.
According to ideal gas equation.
$pV=nRT$ or $\frac{pV}{T}=nR$
As $R$ is a gas constant, so plot between $pV$ versus $T$ would be linear and slope will be $n$. i.e.

Also, from ideal gas equation $p$ is directly proportional to $\frac{1}{V}$.
Therefore, plot between $p$ versus $\frac{1}{V}$ is a straight line, i.e.

Thus, plot (b) is incorrect.