An aqueous solution contains cations of metal X. When a few drops of aqueous sodium hydroxide are added to the solution, a precipitate is formed. The precipitate then dissolves in excess aqueous sodium hydroxide. Which metal could X be?
- Aaluminium ✓, ammonium ✗, zinc ✓
- Baluminium ✓, ammonium ✓, zinc ✗
- Caluminium ✗, ammonium ✗, zinc ✓
- Daluminium ✗, ammonium ✓, zinc ✗