1.
To a 25 mL H2O2\text{H}_2\text{O}_2 solution, excess of acidified solution of KI was added. The iodine liberated required 20 mL of 0.3 N Na2S2O3\text{Na}_2\text{S}_2\text{O}_3 solution. The volume strength of H2O2\text{H}_2\text{O}_2 solution is