A-LevelChemistryNitrogen and sulfurFeb/Mar 2024Paper 1 Q241 Mark
Nitrogen monoxide, NO, is a primary pollutant produced by petrol engines and is found in their exhaust gases. Which reaction occurs in a catalytic converter and decreases the emission of nitrogen monoxide?
ANO(g) + CO(g) → NO₂(g) + C(s)
BNO(g) + CO₂(g) → NO₂(g) + CO(g)
C2NO(g) + 2CO(g) → N₂(g) + 2CO₂(g)
D2NO(g) + CO₂(g) → 2NO₂(g) + C(s)
✓ Correct Answer
The correct answer is C: 2NO(g) + 2CO(g) → N₂(g) + 2CO₂(g)
📋 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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