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The equation 2Cu + O₂ → 2CuO shows copper:

The equation 2Cu + O₂ → 2CuO shows copper:
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  • A Decomposing completely
  • B Losing oxygen atoms
  • C Gaining oxygen atoms
  • D Becoming colourless
Correct Answer: Option C
Explanation:
Copper reacts with oxygen to form copper(II) oxide. Since oxygen is added to copper during the reaction, oxidation has taken place. Oxidation commonly involves the gain of oxygen by a substance.

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