When a copper is exposed to air for a long time it acquires a green coat because it reacts with
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"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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When a copper is exposed to air for a long time it acquires a green coat because it reacts with oxygen in the air
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