The volume of oxygen liberated from 15 ml of 20 volume H2O2 is

Quantity of H2O2 = 15 ml and volume of H2O2 = 20. We know that 20 volume of H2O2 means 1 litre of this solution will give 20 litres of oxygen at N.T.P.Since, oxygen liberated from 1000 ml (1 litre) of H2O2 = 20 litre, therefore oxygen liberate from 15 ml of H2O2 = 201000 × 15 = 0.3 litre = 300 ml