Question

Under the same conditions, the rates of diffusion of two gases are in the ratio 1 : 4. The ratio of their vapour densities is ___.

• A. 2 : 1
• B. 1 : 2
• C. 16 : 1
• D. 1 : 16

Answer 1

The correct option is C

16 : 1

$\frac{r_1}{r_2}=\sqrt{\frac{V{D}_2}{V{D}_1}}$

$\frac{1}{4}=\sqrt{\frac{V{D}_2}{V{D}_1}}$

$\frac{V{D}_1}{V{D}_2}=\frac{16}{1}$