Gases deviate from ideal gas behavior because the molecules $...$

Identify the wrong relation for real gases :

What are the corrections made to the pressure and volume of real gases compared to ideal gases?

Consider the van der Waals constants,$a$ and $b,$ for the following gases.

Gas	$Ar$	$Ne$	$Kr$	$Xe$
$a \ (atm \ dm^6 \ mol^{-2})$	$1.3$	$0.2$	$5.1$	$4.1$
$b \ (10^{-2} \ dm^3 \ mol^{-1})$	$3.2$	$1.7$	$1.0$	$5.0$

Which gas is expected to have the highest critical temperature?

For one mole of a van der Waals' gas,the compressibility factor $Z = (pV/RT)$ at a fixed volume will certainly decrease,if
[Given : $a$ and $b$ are standard parameters for van der Waals' gas]

Write the van der Waals equation.