A-LevelChemistryGroup 17Oct/Nov 2018Paper 1 Q161 Mark

Which statement about the halogens is correct?

Q: What topic does this question test?

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

AIodine cannot behave as an oxidising agent.

BThe volatility of the elements increases from chlorine to iodine because of the increase in molecular size down the group.

CWhen an equimolar mixture of chlorine and hydrogen is exploded, only one product is formed.

DWhen concentrated sulfuric acid is added to solid sodium bromide, hydrogen sulfide is one of the products.

✓ Correct Answer

The correct answer is C: When an equimolar mixture of chlorine and hydrogen is exploded, only one product is formed.

📋 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 2018 examination, Paper 1 Variant 2.

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