O-LevelChemistryAcids, Bases & Salts5070/11 · Oct/Nov 2021 · Q51 Mark

A compound X, when heated with an aqueous solution of compound Y, produces a gas that turns red litmus blue. Which statements are correct? 1 Y could be potassium hydroxide. 2 X is an acid. 3 X could be an ammonium salt. 4 X could be sodium nitrate.

A1, 2 and 3

B1 and 3 only

C3 only

D2 and 4

✓ Correct answer

B: 1 and 3 only

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2021 Paper 1 Variant 1, question 5.

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