Question

The ratio of the rates of diffusion of two gases with molecular weights 100 and 81 is:

• A. 9 : 10
• B. 10 : 9
• C. 100:81
• D. 81:100

Answer 1

The correct option is A 9 : 10

$\frac{r_1}{r_2}=\sqrt{\frac{M_2}{M_1}}$

$\frac{r_1}{r_2}=\sqrt{\frac{81}{100}}=\frac{9}{10}$

Option A is correct.