Chemistry 0620 · IGCSE · Identification of ions and gases

Identification of ions and gases — practice question

Which ion in aqueous solution produces a blue precipitate when aqueous sodium hydroxide is added?

  • A$\text{Ca}^{2+}$
  • B$\text{Cr}^{3+}$
  • C$\text{Cu}^{2+}$
  • D$\text{Fe}^{2+}$

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