A Copper statue was found to lose its lustre after some time. A layer of dull green coating was deposited over it. Explain the cause along with a relevant word equation.
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Answers
Answer:
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. This process is called corrosion of copper.
The green material is a mixture of copper hydroxide (Cu(OH)2) and copper carbonate (CuCO3). The following is the reaction:
2Cu(s)+H 2O(g)+CCO +OO →Cu(OH)2+CCuCO(s)
Copper carbonate is a blue-green compound.
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Answer:
When a copper vessel is exposed with moist air for long it acquires a dull green coating. It is a mixture of copper carbonate CuCO3 and copper hydroxide Cu(OH)2.
Equation
2Cu+H2O+CO2+O2 gives Cu(OH)2+CuCO3
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