O-LevelChemistryAcids, Bases & Salts5070/11 · May/June 2015 · Q101 Mark

Powdered calcium carbonate reacts with dilute hydrochloric acid to produce calcium chloride, water and carbon dioxide. Which is the correct ionic equation, including state symbols, for this reaction?

ACaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l) + CO₂(g)

BCa²⁺(aq) + CO₃²⁻(aq) + 2H⁺(aq) → Ca²⁺(aq) + H₂O(l) + CO₂(g)

CCO₃²⁻(aq) + 2H⁺(aq) → H₂O(l) + CO₂(g)

DCaCO₃(s) + 2H⁺(aq) → Ca²⁺(aq) + H₂O(l) + CO₂(g)

✓ Correct answer

D: CaCO₃(s) + 2H⁺(aq) → Ca²⁺(aq) + H₂O(l) + CO₂(g)

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2015 Paper 1 Variant 1, question 10.

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