O-LevelChemistryAcids, Bases & Salts5070/12 · Oct/Nov 2014 · Q31 Mark

A small amount of aqueous copper(II) sulfate is put into a test-tube. A few drops of aqueous ammonia are added to the test-tube. Then an excess of aqueous ammonia is added to the same test-tube. What are the two observations?

Alight blue precipitate, dark blue solution

Blight blue precipitate, light blue precipitate

Cdark blue solution, dark blue solution

Ddark blue solution, light blue precipitate

✓ Correct answer

A: light blue precipitate, dark blue solution

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2014 Paper 1 Variant 2, question 3.

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