Q54 / 160 · JIPMER 2005 · Chemistry

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

  • A
    $5: 1$
  • Correct answer
    B
    $5: 2$
  • C
    $25: 3$
  • D
    $25: 4$

Solution

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 $5: 2$

Hence, the correct answer is option: 'B'.

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