Weakest van der Waals forces of attraction is seen in which of the following gases?

Q. Assertion :The boiling points of noble gases increases from $He$ to $Xe$ Reason: The interatomic van der Waals attractive forces increase from $He$ to $Xe$

Q. Which of the following observations are incorrect for the noble gases - He, Ne, Ar, Kr, and Xe?

Q. At a given temperature T, gases Ne, Ar, Xe and Kr are found to deviate from ideal gas behaviour. Their equation of state is given as $P=\frac{RT}{V-b}$ at T.
Here, b is the van der Waals constant. Which gas will exhibit steepest increase in the plot of $Z$ (compression factor) vs $P$?

Q. Which of the following noble gases has the highest Van der Waal's force of attraction?

Q. Consider the van der Waals constants, a and b, for the following gases.
$\begin{array}{ccccc}\text{Gas}& \text{Ar}& \text{Ne}& \text{Kr}& \text{Xe}\\ \text{a (atm}d{m}^{6}mo{l}^{-2})& 1.3& 0.2& 5.1& 4.1\\ b\left({10}^{-2}d{m}^{3}mo{l}^{-1}\right)& 3.2& 1.7& 1.0& 5.0\end{array}$
Which gas is expected to have the highest critical temperature?