Question

Identify the pair of gases that have equal rates of diffusion

• A. $CO,NO$
• B. $N_{2}O,CO$
• C. $N_{2}O,C{O}_2$
• D. $C{O}_2,N{O}_2$

Answer 1

Answer: (C)

Rate of diffusion depends upon the molecular masses of gases.
Therefore, the gases which have equal molecular mass,
have equal rates of diffusion.
$\frac{r_1}{r_2}=\sqrt{\frac{M_2}{M_1}}$
Molecular mass of $N_{2}O=28+16=44$
Molecular mass of $C{O}_2=12+32=44$
$\therefore \frac{r_{N_2}O}{r_{C{O}_2}}=1$
$\therefore r_{N_{2}O}=r_{C{O}_2}$