O-LevelChemistryAcids, Bases & Salts5070/12 · May/June 2020 · Q41 Mark

The diagram shows two experiments. What are the results of adding an excess of NaOH(aq) in each experiment?

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Aexperiment 1: precipitate remains, experiment 2: precipitate remains

Bexperiment 1: precipitate remains, experiment 2: precipitate dissolves

Cexperiment 1: precipitate dissolves, experiment 2: precipitate remains

Dexperiment 1: precipitate dissolves, experiment 2: precipitate dissolves

✓ Correct answer

C: experiment 1: precipitate dissolves, experiment 2: precipitate remains

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2020 Paper 1 Variant 2, question 4.

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