In a $P$ versus $V$ graph,the horizontal line is found in which region?

Under which conditions does a gas show the greatest deviation from the ideal gas equation $PV = nRT$?

Statement $-1$: The compressibility factor at the critical point is the same for different gases following van der Waal's equation.
Statement $-2$: The compressibility factor is independent of pressure at the critical temperature.

Explain real gases showing deviations from ideal gas with correction of pressure and volume and derive van der Waals equation.

The deviation will be maximum in the behaviour of a gas from the ideal gas equation $PV = nRT$?

The correct option regarding a container containing $1 \, mol$ of a gas in a $22.4 \, L$ container at $273 \, K$ is: