O-LevelChemistryAcids, Bases & Salts5070/11 · May/June 2018 · Q31 Mark

Tests were carried out on an aqueous solution of an unknown compound, P. The observations are recorded in the table. test observation aqueous sodium hydroxide added green precipitate, soluble in excess giving a green solution dilute nitric acid added then aqueous barium nitrate white precipitate dilute nitric acid added then aqueous silver nitrate no precipitate Which ions are present in P?

ACr³⁺ and Cl⁻

BCr³⁺ and SO₄²⁻

CFe²⁺ and Cl⁻

DFe²⁺ and SO₄²⁻

✓ Correct answer

B: Cr³⁺ and SO₄²⁻

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2018 Paper 1 Variant 1, question 3.

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