A-LevelChemistryReaction kineticsMay/June 2013Paper 1 Q361 Mark
Sulfur dioxide is an atmospheric pollutant that causes acid rain. One of the reactions in this process is the oxidation of sulfur dioxide to sulfur trioxide. This oxidation takes place by a two stage reaction involving oxygen and nitrogen monoxide, NO. NO + ½ O₂ → NO₂ NO₂ + SO₂ → SO₃ + NO Which statements are correct? 1 Nitrogen monoxide is acting as a catalyst for the oxidation. 2 Nitrogen atoms are oxidised in the second stage. 3 Oxygen atoms are first reduced and are then oxidised.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
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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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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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