$A$ clathrate can be defined as:

At the same temperature and pressure,the rate of diffusion of helium with respect to methane is ...... .

Why is it necessary for chemists to understand the laws that govern the physical states of matter?

The rate of diffusion of $H_2$ is .......

Identify the incorrect statement among the following:

$A$ mixture of $He$ and $CH_4$ in a molar ratio of $4:1$ is present in a container at a pressure of $20 \ bar$. Due to a hole in the container,the gas mixture leaks out. What will be the composition of the gas mixture effusing out initially (in $: 1$)?