A-LevelChemistryAnalytical techniquesMay/June 2025Paper 1 Q401 Mark
The mass spectrum of CH3Cl shows a molecular ion peak, M⁺, at the m/e value of 50 with a relative abundance of 18.0%. Other peaks are present in the mass spectrum. What is seen in the mass spectrum at the m/e value of 52?
Apeak with relative abundance of 4.5%
Bpeak with relative abundance of 6.0%
Cpeak with relative abundance of 18.0%
Dpeak with relative abundance of 54.0%
✓ Correct Answer
The correct answer is B: peak with relative abundance of 6.0%
📋 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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