Which of the following pair will diffuse at the same rate?

Question

Accepted Answer

A. $$\mathrm{CO_2}$$ and $$\mathrm{N_2O}$$

By Graham's law, gases diffuse at the same rate when their molar masses are equal.
$$M(\mathrm{CO_2})=12+2	imes 16=44$$
$$M(\mathrm{N_2O})=2	imes 14+16=44$$
$$M(\mathrm{NO})=14+16=30$$
$$M(\mathrm{CO})=12+16=28$$
So the pair with equal molar mass is $\mathrm{CO_2}$ and $\mathrm{N_2O}$. On checking the options, this is option $A$.

Answer

$$\mathrm{CO_2}$$ and $$\mathrm{NO}$$

Answer

$$\mathrm{CO_2}$$ and $$\mathrm{CO}$$

Answer

$$\mathrm{N_2O}$$ and $$\mathrm{NO}$$