when a copper vessel is kept in moist air it acquires a dull green coating?why?

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Solution

Copper metal develops a green layer of basic copper carbonate in presence of moist air. The reaction is as follows:

$2 C u + C O_{2} + H_{2} O + O_{2} \to C u C O_{3} . C u (O H)_{2} g r e e n$

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when a copper vessel is kept in moist air it acquires a dull green coating?why?

Copper metal develops a green layer of basic copper carbonate in presence of moist air. The reaction is as follows: 2Cu + CO2 + H2O + O2 →CuCO3.Cu(OH)2 green

Copper metal develops a green layer of basic copper carbonate in presence of moist air. The reaction is as follows:

$2 C u + C O_{2} + H_{2} O + O_{2} \to C u C O_{3} . C u (O H)_{2} g r e e n$