Question

When manganese dioxide is added to hydrogen peroxide write your observation and name the products formed

Answer 1

 If manganese dioxide is added to hydrogen peroxide,then hydrogen peroxide decomposes into two moles of water and one mole of oxygen.Here MnO2 acts as a catalyst.
   H2O2------>2H2O+O2 in the presence of MnO2 catalyst and it is a slightly exothermic reaction.