O-LevelChemistryAcids, Bases & Salts5070/12 · May/June 2022 · Q31 Mark
Some reactions of an aqueous solution of compound X are given. • When a few drops of aqueous sodium hydroxide are added, a white precipitate is formed. • When dilute nitric acid is added and the mixture is warmed, a gas is formed. The gas decolourises acidified potassium manganate(VII). • When dilute nitric acid and aqueous barium nitrate are added, no visible reaction occurs. What can be deduced about the identity of X?
AX contains only aluminium sulfate, Al₂(SO₄)₃.
BX contains only calcium sulfite, CaSO₃.
CX must contain aluminium sulfite, Al₂(SO₃)₃, or zinc sulfite, ZnSO₃.
DX must contain aluminium sulfite, Al₂(SO₃)₃, calcium sulfite, CaSO₃, or zinc sulfite, ZnSO₃.
✓ Correct answer
D: X must contain aluminium sulfite, Al₂(SO₃)₃, calcium sulfite, CaSO₃, or zinc sulfite, ZnSO₃.
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