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      Question

      When kept in air for some time, a layer of green colored

      basic carbonate forms on the metal, that metal is ___________________ .
      A nickel Correct Answer Incorrect Answer
      B Silver Correct Answer Incorrect Answer
      C Copper Correct Answer Incorrect Answer
      D Zinc Correct Answer Incorrect Answer

      Solution

      Copper metal when exposed to air turns green in colour due to corrosion. When a copper vessel is exposed to air in the rainy season, the metal reacts with gases, moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide. This gives a green colour to the surface of copper metal.

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