Question

X ml of $H_2$ gas effuse through a pin hole in a container in 5s, the time taken for the effusion of the same volume of the gas specified below uner identical conditions is ?

• A. $10s:He$
• B. $20s:O_2$
• C. $25s:CO$
• D. $55s:C{O}_2$

Answer 1

The correct option is B $20s:O_2$

$\frac{r_{H_2}}{r_{O_2}}=\frac{\frac{x}{5}}{\frac{x}{t}}=\frac{t}{5}=\sqrt{\frac{32}{2}}=4\Rightarrow t=20s$