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Ratio of molecular weights of $A$ and $B$ is $\frac{4}{25}$ then ratio of rates of diffusion will be
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The correct answer is:
$5: 2$
According to Graham's rule
$\begin{array}{l}\frac{r_1}{r_2} =\sqrt{\frac{M_2}{M_1}} \\ \text {or } \frac{r_1}{r_2} =\sqrt{\frac{25}{4}} \\ \Rightarrow =\frac{5}{2}\end{array}$
Hence ratio of diffusion is $5: 2$
$\begin{array}{l}\frac{r_1}{r_2} =\sqrt{\frac{M_2}{M_1}} \\ \text {or } \frac{r_1}{r_2} =\sqrt{\frac{25}{4}} \\ \Rightarrow =\frac{5}{2}\end{array}$
Hence ratio of diffusion is $5: 2$
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