A-LevelChemistryNitrogen and sulfurMay/June 2015Paper 1 Q181 Mark

Carbon monoxide, CO, nitrogen dioxide, NO₂, and sulfur dioxide, SO₂, are all atmospheric pollutants. Which reaction concerning these compounds occurs in the atmosphere?

Q: What is the correct answer to this A-Level Chemistry question?

The correct answer is C: NO₂ is reduced to NO by SO₂.

Q: What topic does this question test?

This question tests Nitrogen and sulfur in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

ACO is spontaneously oxidised to CO₂

BNO₂ is reduced to NO by CO

CNO₂ is reduced to NO by SO₂

DSO₂ is oxidised to SO₃ by CO₂

✓ Correct Answer

The correct answer is C: NO₂ is reduced to NO by SO₂

📋 Examiner Report & Trap Analysis

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...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Chemistry Question

Topic

This multiple-choice question tests Nitrogen and sulfur in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2015 examination, Paper 1 Variant 2.

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