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O-LevelChemistryAcids, Bases & Salts5070/11 · Oct/Nov 2023 · Q201 Mark

Limewater is aqueous calcium hydroxide. Which statement about limewater is correct?

AIt has a pH below 7.
BIt gives a blue-green colour in the flame test.
CIt reacts with ammonia to form an ammonium salt.
DIt turns yellow when methyl orange is added.

✓ Correct answer

D: It turns yellow when methyl orange is added.

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About this question

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 20.

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