The reaction between H2O2 and KMnO4 is 2KMnO4 + 3H2SO4 + 5H2O2 → K2SO4 + 2MnSO4 + 8H2O + 5O2.If 30 ml H2O2 is required to reduce 15 ml 0.02 M KMnO4 solution, the molarity of H2O2 is

2 KMnO4 + 3H2SO4 + 5H2O2 → K2SO4 + 2MnSO4 + 8H2O + 5O2No of equivalents of H2O2 = No of equivalents of KMnO4 N1 x 30 = 0.02 x 5 x 15   0.025M,30ml H2O2 is required to reduce 15ml of 0.02M KMnO4 solution.