2. Why do copper objects develop a green coating in air? Write down the
chemical equation to show this change.
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Explanation:
Copper metal when exposed to air turns green in colour due to corrosion. When copper vessel is exposed to air in rainy season, the metal reacts with gases and 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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ANSWER
Copper reacts with moist carbon dioxide in the air and gains a green coating of basic copper carbonate
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