A-LevelChemistryElectrochemistryOct/Nov 2021Paper 1 Q101 Mark
In a catalytic converter in the exhaust system of a car, carbon monoxide is oxidised to carbon dioxide, and nitrogen monoxide is reduced to nitrogen. What are the changes in oxidation number of carbon and nitrogen in these two processes?
A-2 for carbon, +2 for nitrogen
B-1 for carbon, +1 for nitrogen
C+1 for carbon, -1 for nitrogen
D+2 for carbon, -2 for nitrogen
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of electrochemistry within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 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...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep