A-LevelChemistryNitrogen and sulfurOct/Nov 2012Paper 1 Q161 Mark
In a car engine, non-metallic element X forms a pollutant oxide Y. Y can be further oxidised to Z. Two students made the following statements. Student P: The molecule of Y contains lone pairs of electrons. Student Q: The oxidation number of X increases by 1 from Y to Z. X could be carbon or nitrogen or sulfur. Which student could be correct if X were any of these elements?
AP only
BQ only
Cboth P and Q
Dneither P nor Q
✓ Correct Answer
The correct answer is A: P only
📋 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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