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Briefly answer the following questions:
Paheli bought a statue made of copper. To her surprise it acquired a dull green coating after a couple of months. Explain the reason.
When a copper statue (or copper vessel) is exposed to for long, it acquires a dull green coating. The green material is a mixture of copper hydroxide and formed due to the reaction of copper with moist air.
The following is the reaction is
\(2Cu + H_2O + CO_2 + O_2 \to Cu(OH)_2 + CuCO_3\)
The green coating is commonly known as 'basic copper carbonate', and the formation of a green coating on copper objects shows .
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