Question

what is the chemical reaction between magnese dioxide and hydrogen peroxide

Answer 1

MnO² +H²O²------>Mn(OH)²+O²
when mangnese dioxide reacts with hydrogen peroxide to form mangnese hydroxide and oxygen gas

Answer 2

This is a great demonstration to illustrate the effect of the breakdown of H2O2 to H2O and O2: Manganese dioxide catalyzes the decomposition of hydrogen peroxide to oxygen and water. Since manganese dioxide is a catalyst, it is not consumed in the reaction.                                                           H2O2(g) + MnO2(s) -----------> H2O(l) + 2O2(g)