Chemistry 5070 · O Level · Identification of ions and gases

Identification of ions and gases — practice question

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 ✗

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