Chemistry · May / June 2022 · Paper 12 · Question 3
5070Identification of ions and gases
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.
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Correct answer: D. X must contain aluminium sulfite, Al2(SO3)3, calcium sulfite, CaSO3, or zinc sulfite, ZnSO3.
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