A-LevelChemistryReaction kineticsMay/June 2017Paper 1 Q341 Mark
The rate of chemical reactions can be increased by the addition of a suitable catalyst. For which reactions can a heterogeneous catalyst be used? 1 N₂(g) + 3H₂(g) ⇌ 2NH₃(g) 2 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) 3 2NO(g) + 2CO(g) ⇌ N₂(g) + 2CO₂(g)
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct Answer
The correct answer is A: 1, 2 and 3 are correct
📋 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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