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?

According to the kinetic molecular theory of gases,which of the following is true?

At $298 \, K$,assuming ideal behaviour,the average kinetic energy of a deuterium molecule is

Two gases $A$ and $B$ are released from the two ends of a tunnel of length $100 \ m$. $A$ travels $40 \ m$ before meeting the gas $B$ in the tunnel. If the molecular weight of $B$ is $18$, what is the molecular weight of $A$ (in $.5$)?

What is the temperature at which the kinetic energy of $0.3 \ mol$ of helium is equal to the kinetic energy of $0.4 \ mol$ of argon at $400 \ K$ (in $K$)?

Which of the following describes an ideal gas?
$(i)$ The volume occupied by a gas molecule is negligible.
$(ii)$ The collision between ideal gas molecules are elastic.
$(iii)$ Particles are very small compared to the distance between each other.