Chemistry · May / June 2019 · Paper 12 · Question 19

Hydrogen peroxide decomposes slowly at room temperature. 2H2O2(aq) → 2H2O(l) + O2(g) The reaction can be catalysed by adding manganese(IV) oxide. The diagram shows the apparatus that can be used to monitor the rate of this reaction. Which statement is correct when a catalyst is added to the aqueous hydrogen peroxide?

1. AThe catalyst increases the activation energy for the reaction.
2. BThe catalyst is used up during the reaction.
3. CThe gas syringe fills up more quickly when the catalyst is added.
4. DThe total amount of oxygen produced increases when the catalyst is added.

As printed in the paper