When concentrated sulfuric acid is added to solid sodium chloride, HCl is formed but not Cl2. When concentrated sulfuric acid is added to solid sodium iodide, I2 is formed. Which statement explains these observations?
✓ Correct Answer
The correct answer is B: Sulfuric acid is an oxidising agent and iodide ions are more easily oxidised than chloride ions.
📋 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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