A-LevelChemistryElectrochemistryMay/June 2016Paper 1 Q171 Mark
Nitrogen(II) oxide, NO, nitrogen(IV) oxide, NO₂, carbon monoxide, CO, and unburnt hydrocarbons are present in the exhaust gases of internal combustion engines. When catalytic converters are used to remove these compounds from the exhaust gases, redox reactions occur. What happens to each compound in the catalytic converter? NO NO₂ CO hydrocarbons oxidised oxidised reduced oxidised oxidised oxidised oxidised oxidised reduced reduced oxidised oxidised reduced reduced reduced reduced
Aoxidised oxidised reduced oxidised
Boxidised oxidised oxidised oxidised
Creduced reduced oxidised oxidised
Dreduced reduced reduced reduced
✓ Correct Answer
The correct answer is C: reduced reduced oxidised oxidised
📋 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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