What is the order of this reaction

Question

The half life of the reaction shown below is found not to depend on the concentration of H2O2(aq).

2 H2O2(aq) -> 2 H20(l) O2 (g)

what is the order of this reaction ?

a)- first b)- second c)- third d)- or zeroth ?

Answer 1

order is the no. of molecules that take part in the reaction...therefore the answer here is 1st order

Answer 2

if the half-life doesn't depend on concentration, then the reaction is 0-th order.

Answer 3

zero.the reaction procedes:in a flask with  h2o2-(bleaching stuff)

WHEN you add MnO2(a black powder) oxygen begins to evolve on the surface of  the grains MnO2-this is the catalist responsable for the reaction,no matter if the solution is dilute or concentrated.