Question

The volume of oxygen liberated from 15 ml of 20 volume $H_{2}O_{2}$ is.

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

Answer 1

Answer: (B)

300 ml

Answer 2

Quantity of $H_{2}O_{2} = 15ml$ and volume of $H_{2}O_{2} = 20$

We know that 20 volume of $H_{2}O_{2}$ means 1 litre of this solution will give 20 litre of oxygen at N.T.P.

Since, oxygen liberated from 1000 ml (1 litre) of $H_{2}O_{2} = 20litre$, therefore oxygen liberate from 15 ml of $H_{2}O_{2}$ $= \frac{20}{1000} \times 15 = 0.3litre = 300ml$