Question

Ratio of molecular weights of $A$ and $B$ is $\frac{4}{25}$ then ratio of rates of diffusion will be:

• A. 5:01
• B. 5:02
• C. 25:03:00
• D. 25:04:00

Answer 1

Answer: (B)

5:02

Answer 2

According to Graham's rule
$\frac{r_{1}}{r_{2}} =\sqrt{\frac{M_{2}}{M_{1}}}$
or $\frac{r_{1}}{r_{2}} =\sqrt{\frac{25}{4}}$
$\Rightarrow =\frac{5}{2}$
Hence ratio of diffusion is $5: 2$