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A-LevelChemistryReaction kinetics9701/12 · May/June 2013 · 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

✓ Correct answer

D: 1 only is correct

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About this question

Topic
Reaction kinetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source
A-Level Chemistry, May/June 2013 Paper 1 Variant 2, question 36.

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