DPP 4.5

The value of compressibility factor of a Van der Waal's gas at critical point is:

The pressure exerted by $1 \mathrm{mole}$ of ${\mathrm{CO}}_2$ at $273 \mathrm{K}$ is $34.98 \mathrm{atm}$, assuming that volume occupied by ${\mathrm{CO}}_2$ molecules is negligible. The value of Van der Waal's constant for attraction of ${\mathrm{CO}}_2$ gas is:

For one mole of a Van der Waal's gas when, $\mathrm{b}=0$ and $\mathrm{T}=300 \mathrm{K}$, the $\mathrm{PV}$ vs $1/\mathrm{V}$ plot is shown below. The value of the Van der Waal's constant  $\mathrm{a} \left(atm{litre}^2{\mathrm{mol}}^{-2}\right)$ is: 

Which of the following statements are correct?

Which of the following statements are not correct? 

Which of the following statements are correct? 

Which of the following statements is/are correct about real gases? 

At a very high pressure, Van der Waal's equation reduces to: