A-LevelChemistryEquilibriaOct/Nov 2019Paper 1 Q191 Mark

Ammonia, carbon dioxide and water react together to form ammonium carbonate. Which statement about this reaction is correct?

Q: What is the correct answer to this A-Level Chemistry question?

The correct answer is B: It is an acid-base reaction..

Q: What topic does this question test?

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

AIt is a redox reaction.

BIt is an acid-base reaction.

CThe H-N-H bond angle decreases as a consequence of this reaction.

DThe three substances react in a 1:1:1 ratio in this reaction.

✓ Correct Answer

The correct answer is B: It is an acid-base reaction.

📋 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 Equilibria in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2019 examination, Paper 1 Variant 2.

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