Question

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

• A. $N_2$
• B. $O_2$
• C. $H_2$
• D. He

Answer 1

Answer: (C)

$H_2$

Answer 2

Lower the density of the gas, faster it will be filled. Since the density of $H_2$ is the lowest, it will be filled firs