O-LevelChemistryAcids, Bases & Salts5070/11 · Oct/Nov 2023 · Q401 Mark

A student does two experiments. In experiment 1, ammonium carbonate is reacted with dilute hydrochloric acid. In experiment 2, ammonium carbonate is heated with aqueous sodium hydroxide. In each experiment, the gas evolved is tested with damp blue litmus paper and damp red litmus paper. Which row correctly shows the colour of both pieces of litmus paper at the end of each experiment? experiment 1, experiment 2

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Ablue, blue

Bblue, red

Cred, blue

Dred, red

✓ Correct answer

C: red, blue

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

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