Chemistry 0620 · IGCSE · Ions and ionic bonds

Ions and ionic bonds — practice question

The colours of anhydrous copper(II) sulfate and anhydrous cobalt(II) chloride change when water is added. Which row gives the correct colour changes?

  • Acopper(II) sulfate: blue to white; cobalt(II) chloride: blue to pink
  • Bcopper(II) sulfate: blue to white; cobalt(II) chloride: pink to blue
  • Ccopper(II) sulfate: white to blue; cobalt(II) chloride: blue to pink
  • Dcopper(II) sulfate: white to blue; cobalt(II) chloride: pink to blue

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