O-LevelChemistryAcids, Bases & Salts5070/12 · May/June 2014 · Q301 Mark

Which gas turns moist blue litmus paper red and produces a precipitate when bubbled through calcium hydroxide solution?

ACO

BCO₂

CHCl

DNH₃

✓ Correct answer

B: CO₂

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2014 Paper 1 Variant 2, question 30.

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