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Metals and Non-Metals

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Multiple Choice

When a copper vessel is exposed to moist air, a green coating is formed on its surface. What chemical compounds are present in that coating?

  1. Magnesium oxide and magnesium hydroxide
  2. Copper oxide and copper hydroxide
  3. Copper hydroxide and copper carbonate
  4. Copper oxide and copper carbonate
  5. Magnesium oxide and copper oxide
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