Saloni bought some decorative lamps made of copper. After six months, she noticed the development of a green colour substance on the lamps. What could be the reason for this change. Explain with a word equation.
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When exposed to air and under moisture, copper reacts with water and oxygen. The copper first oxidizes to copper oxide and then undergoes further changes to finally form hydrated copper carbonate which is in green colour.
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When a copper vessel is exposed to moist air for a long time it develops a green layer on its surface. Copper corrodes by oxidation in which it reacts with oxygen in the air to form copper oxide. Copper oxide then combines with carbon dioxide to make copper carbonate, which gives it a green colour.
Copper + water + carbon dioxide = copper carbonate+ hydrogen
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