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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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