Chemistry · Oct / Nov 2024 · Paper 11 · Question 40
5070Identification of ions and gases
An aqueous solution contains cations of metal X. A precipitate forms when a few drops of aqueous sodium hydroxide are added to the solution. The precipitate dissolves in excess aqueous sodium hydroxide. What is a possible identity of metal X?
- Aaluminium ✓, ammonium ✗, zinc ✓
- Baluminium ✓, ammonium ✓, zinc ✗
- Caluminium ✗, ammonium ✗, zinc ✓
- Daluminium ✗, ammonium ✓, zinc ✗
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Correct answer: A. aluminium ✓, ammonium ✗, zinc ✓
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