Question

Identify the pair of gases that have equal rates of diffusion

• A. $CO, NO$
• B. $N_2O,CO$
• C. $N_{2}O,CO_{2}$
• D. $CO_{2},NO_{2}$

Answer 1

Answer: (C)

$N_{2}O,CO_{2}$

Answer 2

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 $CO _{2}=12 +32=44$
$\therefore \frac{r_{N_{2}} O }{r_{ CO _{2}}}=1$
$\therefore r_{N_{2} O}=r_{C O_{2}}$