Chemistry 0620 · IGCSE · Elements, compounds and mixtures

Elements, compounds and mixtures — practice question

Which of the following statements is correct?

  • AWhen anhydrous copper(II) sulfate is heated its colour changes to a deeper blue.
  • BWhen hydrated copper(II) sulfate is heated its colour changes to a deeper blue.
  • CWhen water is added to blue cobalt(II) chloride paper it turns pink.
  • DWhen water is added to pink cobalt(II) chloride paper it turns blue.

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