O-LevelChemistryAcids, Bases & Salts5070/11 · May/June 2022 · Q131 Mark

Aqueous calcium hydroxide is an alkali. It is neutralised by dilute nitric acid to produce calcium nitrate and water. What is the ionic equation for this reaction?

ACa⁺ + OH¯ + H⁺ + NO3¯ → CaNO3 + H2O

BCa(OH)2 + 2HNO3 → Ca(NO3)2 + H2O

CCa²⁺(OH)2 + 2H⁺NO3¯ → Ca²⁺(NO3¯)2 + H2O

DOH¯ + H⁺ → H2O

✓ Correct answer

D: OH¯ + H⁺ → H2O

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2022 Paper 1 Variant 1, question 13.

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