Question

Which of the following pairs of gases diffuse through a porous plug with the same rate of diffusion?

• A. $CO$ and $NO$
• B. $N{O}_2$ and $C{O}_2$
• C. $N{H}_3$ and $P{H}_3$
• D. $NO$ and $C_2{H}_6$

Answer 1

The correct option is D $NO$ and $C_2{H}_6$

Graham's law states that the rate of diffusion or of effusion of a gas is inversely proportional to the square root of its molecular weight.

The molecular mass of $NO$ and $C_2{H}_6$ is the same. Hence, both diffuse with the same rate of diffusion.

Hence, the correct answer is option $\text{D}$.