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JEE Main levelSingle correct optionDifficulty 2 of 3ig072

$50 mL$ of $O X_{2}$ effuses through a porous plug in $20 s$ . Under the same conditions, the volume of $H X_{2}$ effusing in $20 s$ is

A $200 mL$
B $100 mL$
C $12.5 mL$
D $400 mL$

Answer: A

\frac{r _{H X_{2}}}{r _{O X_{2}}} = \frac{32}{2} = 4

. In the same time

H X_{2}

effuses four times the volume:

4 \times 50 = 200 mL

.

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