A-LevelChemistryGroup 17Oct/Nov 2009Paper 1 Q351 Mark
Which statements about the reaction of solid sodium bromide with concentrated sulfuric acid are correct? 1 Hydrogen bromide is a product of the reaction. 2 Sulfuric acid is oxidised to sulfur dioxide. 3 Bromide ions are reduced to bromine.
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 D: 1 only is 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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