• # question_answer The rate of diffusion of hydrogen gas is [MH CET 2003; Pb. CET 2000] A)                 1.4 times to $He$ gas   B)                 Same as $He$ gas C)                 5 times to $He$ gas      D)                 2 times to $He$ gas

We know that molecular mass of hydrogen ${{M}_{1}}=2$ and that of helium ${{M}_{2}}=4$, we also know that Graham's law of diffusion                                 $\frac{{{r}_{1}}}{{{r}_{2}}}=\sqrt{\frac{{{M}_{2}}}{{{M}_{1}}}}=\sqrt{\frac{4}{2}}=\sqrt{2}=1.4$;  ${{r}_{1}}=1.4m$