A-LevelChemistryGroup 17Oct/Nov 2010Paper 1 Q161 Mark

What happens when chlorine is bubbled through aqueous potassium iodide?

Q: What topic does this question test?

This question tests Group 17 in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

AChlorine is oxidised to chlorate(V) ions.

BChlorine is oxidised to chloride ions.

CIodide ions are oxidised to iodine.

DThere is no observable reaction.

✓ Correct Answer

The correct answer is C: Iodide ions are oxidised to iodine.

📋 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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About This A-Level Chemistry Question

Topic

This multiple-choice question tests Group 17 in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2010 examination, Paper 1 Variant 2.

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