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A-LevelChemistryGroup 29701/12 · May/June 2025 · 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?

Acalcium carbonate

Bcalcium nitrate

Cstrontium carbonate

Dstrontium nitrate

✓ Correct answer

B: calcium nitrate

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About this question

Topic: Group 2, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2025 Paper 1 Variant 2, question 23.

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