when a copper object is exposed to moist air for a long time then a greenish deposit is formed on earth surface which chemical forms the green coating
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It reacts wid co2 & forms greenish coating called cuco3
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When a copper is exposed to moist air for long, it acquires a dull green coating. The green material is a mixture of copper hydroxide (Cu(OH)2) and copper carbonate (CuCO3). The following is the reaction
2Cu+H2O+CO2+O2→Cu(OH)2+CuCO3
moist air
2Cu+H2O+CO2+O2→Cu(OH)2+CuCO3
moist air
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