O-LevelChemistryAcids, Bases & Salts5070/12 · May/June 2023 · Q401 Mark

Aqueous sodium hydroxide is used to identify the ions present in aqueous solutions of compounds Q and R. The results are shown. Which row is correct?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

ACr³⁺; NH4⁺

BCu²⁺; CO3²⁻

CFe²⁺; CO3²⁻

DFe³⁺; NH4⁺

✓ Correct answer

A: Cr³⁺; NH4⁺

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2023 Paper 1 Variant 2, question 40.

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