Why do copper loses its lustre and develop a green coating over it when exposed to atmosphere
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The copper at the surface will get oxidised by oxygen and forms a green coating of copper oxide over its surface .
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Answer: copper metal when exposed to air turns in green in colour due to corrosion.
Explanation: when a copper object remains in damp air for a long time,it reacts slowly with carbon dioxide and water of air . It loses it shine due to formation of a green coating of copper hydroxide and copper carbonate on the surface of the object.
2Cu + O² + H²O + CO² = Cu(OH)² + CuCO³
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