The correction factor '$a$' in the van der Waals equation for real gases corresponds to:

When is deviation more in the behaviour of a gas from the ideal gas equation $PV = nRT$?

Pressure versus volume graph for a real gas and an ideal gas are shown in the figure. Answer the following questions on the basis of this graph:
$(i)$ Interpret the behaviour of real gas with respect to ideal gas at low pressure.
$(ii)$ Interpret the behaviour of real gas with respect to ideal gas at high pressure.
$(iii)$ Mark the pressure and volume by drawing a line at the point where real gas behaves as an ideal gas.

If the compressibility factor $(Z)$ of a gas at $STP$ is greater than $1$,then what will be the value of its molar volume $(V_m)$?

The temperature at which the second virial coefficient of a real gas is zero is called:

For real gases,the relation between $P$,$V$ and $T$ is given by the van der Waals equation,$(P + \frac{an^2}{V^2})(V - nb) = nRT$. For the following gases $CH_4, CO_2, O_2, H_2$,which gas will have $(i)$ highest value of $'a'$ $(ii)$ lowest value of $'b'$?