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  1. Copper(II) oxide - Wikipedia

  2. Copper oxide - Wikipedia

  3. Copper Oxide | Formula, Properties & Application

  4. Copper(I) oxide - Wikipedia

  5. What is Copper Oxide? (with pictures) - AllTheScience

  6. Copper (II) Oxide | Formula, Properties & Application

  7. Copper Oxide - Properties, Structure, Uses and Preparation

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