A-LevelChemistryGroup 2May/June 2025Paper 1 Q231 Mark

1.0 g of each of four different compounds of Group 2 elements are thermally decomposed. The residue in each decomposition is the oxide of the Group 2 element. The volume of gas produced from each reaction is measured at room conditions. Which substance produces the greatest volume of gas?

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

The correct answer is B: calcium nitrate.

Q: What topic does this question test?

This question tests Group 2 in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Acalcium carbonate

Bcalcium nitrate

Cstrontium carbonate

Dstrontium nitrate

✓ Correct Answer

The correct answer is B: calcium nitrate

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

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2025 examination, Paper 1 Variant 2.

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