Question

The volume of $20V-H_2{O}_2$ solution, required to prepare $5$ litres of oxygen at STP is:

• A. $125$ ml
• B. $250$ ml
• C. $100$ ml
• D. $50$ ml

Answer 1

The correct option is B $250$ ml

$20$ ml of $O_2$ is prepared by $1$ ml of $H_2{O}_2$ at STP.

$1$ ml of $O_2$ is prepared by $=\frac{1}{20}$ ml of $H_2{O}_2$.

$5000$ ml of $O_2$ is prepared by = $\frac{1}{20}\times 5000=250$ ml of $H_2{O}_2$.

Hence, option B is correct.