A-LevelChemistryReaction kinetics9701/12 · Oct/Nov 2021 · Q111 Mark

NO and NO2 are both present in the lower atmosphere as pollutants. The reaction sequence shows the production of ozone from oxygen in the lower atmosphere. This sequence repeats many times. NO2(g) → NO(g) + O(g) NO(g) + ½O2(g) → NO2(g) O2(g) + O(g) → O3(g) Which statement about this reaction sequence is correct?

ANO is acting as a catalyst, but NO2 is not acting as a catalyst.

BNO2 is acting as a catalyst, but NO is not acting as a catalyst.

CNeither NO nor NO2 are acting as catalysts.

DBoth NO and NO2 are acting as catalysts.

✓ Correct answer

D: Both NO and NO2 are acting as catalysts.

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Topic: Reaction kinetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2021 Paper 1 Variant 2, question 11.

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