O-LevelChemistryAcids, Bases & Salts5070/12 · Oct/Nov 2022 · Q281 Mark

Solution X is added to a solid salt, causing gas Y to be evolved. Gas Y dissolves in water resulting in a solution with a pH of less than 7. What are the possible identities of X and Y?

Aaqueous sodium hydroxide, ammonia

Baqueous sodium hydroxide, carbon dioxide

Cdilute hydrochloric acid, ammonia

Ddilute hydrochloric acid, carbon dioxide

✓ Correct answer

D: dilute hydrochloric acid, carbon dioxide

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2022 Paper 1 Variant 2, question 28.

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