Which of the following is an incorrect postulate of the kinetic molecular theory of gases?

At the same temperature and pressure,which of the following will have the highest kinetic energy per mole?

If the four tubes of a car are filled to the same pressure with $N_2$,$O_2$,$H_2$ and $Ne$ separately,then which one will be filled first?

If a gas expands at a constant temperature,then...

Among the following,the plot that shows the correct marking of most probable velocity $(V_{mp})$,average velocity $(\bar{V})$,and root mean square velocity $(V_{rms})$ is

According to the kinetic theory of gases,which of the following statements are correct?
$A$. Collisions are always elastic.
$B$. Heavier molecules transfer more momentum to the wall of the container.
$C$. Only a small number of molecules have very high velocity.
$D$. Between collisions,the molecules move in straight lines with constant velocities.