O-LevelChemistryStoichiometry5070/12 · May/June 2020 · Q131 Mark

Which row shows the correct state symbols for the reaction between calcium carbonate and dilute hydrochloric acid? (The conditions are room temperature and pressure.) CaCO3 + 2HCl → CaCl2 + H2O + CO2

ACaCO3: s, HCl: aq, CaCl2: aq, H2O: aq, CO2: g

BCaCO3: s, HCl: l, CaCl2: aq, H2O: l, CO2: g

CCaCO3: s, HCl: l, CaCl2: l, H2O: aq, CO2: g

DCaCO3: s, HCl: aq, CaCl2: aq, H2O: l, CO2: g

✓ Correct answer

D: CaCO3: s, HCl: aq, CaCl2: aq, H2O: l, CO2: g

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Topic: Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2020 Paper 1 Variant 2, question 13.

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