(a) Manganese(IV) oxide, MnO2, catalyses the decomposition of hydrogen peroxide, H2O2, as shown.
MnO2
2H2O2(aq) → 2H2O(l) + O2(g)
The mechanism involves the formation of the intermediate species, Mn2+, in the first step which is subsequently used up in the second step.
State and use relevant electrode potentials, Eº, to construct two equations to show how MnO2 can catalyse this reaction.
equation 1
equation 2

Q: What topic does this question test?

This question tests Electrochemistry in A-Level Chemistry (syllabus code 9701). It is worth 7 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry May/June 2020 examination, Paper 4 Variant 1 (9701_s20_qp_41.pdf).

Question

(a) Manganese(IV) oxide, MnO2, catalyses the decomposition of hydrogen peroxide, H2O2, as shown.
MnO2
2H2O2(aq) → 2H2O(l) + O2(g)
The mechanism involves the formation of the intermediate species, Mn2+, in the first step which is subsequently used up in the second step.
State and use relevant electrode potentials, Eº, to construct two equations to show how MnO2 can catalyse this reaction.
equation 1
equation 2

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