Chemistry 0620 · IGCSE · Elements, compounds and mixtures

Elements, compounds and mixtures — practice question

X is a pink solid. Y is a blue solid. When X is heated, water is formed and the solid becomes blue. When water is added to Y, the solid becomes pink. Identify X and Y?

  • AX: anhydrous cobalt(II) chloride; Y: hydrated cobalt(II) chloride
  • BX: hydrated cobalt(II) chloride; Y: anhydrous cobalt(II) chloride
  • CX: anhydrous copper(II) sulfate; Y: hydrated copper(II) sulfate
  • DX: hydrated copper(II) sulfate; Y: anhydrous copper(II) sulfate

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