A-LevelChemistryReaction kinetics9701/12 · Feb/Mar 2022 · Q111 Mark

Hydrogen peroxide, H₂O₂, decomposes to form water and oxygen. The reaction is catalysed by bromide ions. step 1 2Br⁻(aq) + H₂O₂(aq) + 2H⁺(aq) → 2H₂O(l) + Br₂(aq) step 2 H₂O₂(aq) + Br₂(aq) → 2Br⁻(aq) + 2H⁺(aq) + O₂(g) Which row is correct? [Figure 11.1]

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Aheterogeneous, bromide ions are oxidised

Bheterogeneous, bromide ions are reduced

Chomogeneous, bromide ions are oxidised

Dhomogeneous, bromide ions are reduced

✓ Correct answer

C: homogeneous, bromide ions are oxidised

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Topic: Reaction kinetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2022 Paper 1 Variant 2, question 11.

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