Question

Which of the following gases have same rate of diffusion at constant $P$ and $T$?

• A. $C_2{H}_6$
• B. $C_2{H}_4$
• C. $N_2$
• D. $CO$

Answer 1

Answer: (B), (C), (D)

$N_2$
$C_2{H}_4$
$CO$

Graham's law of diffusion states "under the same conditions of temperature and pressure, the rates of diffusion of different gases are inversely proportional to the square roots of their molecular masses or their densities."
As $N_2,C_2{H}_4$ and $CO$ have same mass so they will have equal rate of diffusion.