A-LevelChemistryReaction kineticsFeb/Mar 2019Paper 1 Q341 Mark
Some polluting gases are removed from car exhaust fumes using a catalytic converter. Platinum or palladium can be used as the catalyst. The reactions are faster when platinum is the catalyst than they are when palladium is the catalyst. Which statements are correct? 1 Platinum acts as a heterogeneous catalyst in these reactions. 2 The palladium-catalysed reactions have higher activation energies than the platinum-catalysed reactions. 3 The platinum-catalysed reactions are more exothermic than the palladium-catalysed reactions.
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 B: 1 and 2 only 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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