A-LevelChemistryReaction kineticsOct/Nov 2021Paper 1 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.
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The correct answer is D. This question tests the candidate's understanding of reaction kinetics within the Chemistrysyllabus. The examiner's mark scheme requires...
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