Question

The volume of oxygen liberated from $15$ml of $20$ volume $H_2{O}_2$ is:

• A. $250ml$
• B. $300ml$
• C. $150ml$
• D. $200ml$

Answer 1

The correct option is B $300ml$

$20$ volume of $H_2{O}_2$ means $1L$ of this solution will give $20L$ $O_2$ at $NTP$ .

Since Oxygen liberated from $1000ml\left(1L\right)$ of $H_2{O}_2$ is $20L$.

So, Oxygen liberated from $15ml=\left(\frac{20}{1000}\right)\times 15=0.3L=300ml$