cl2o7 + H2o2---- clo2- +H2o balence the chemical reaction
The answer after balancing the above equation is CI2O7+4H2O2--->CIO2-+4O2.You can get this answer after calculating the oxidation number change of each ion and use the ion electron method. To balance the reaction the number of ions of the reactants should match with the number of ions of the product.