Question

What type of coating is formed on copper articles when they get corroded? Give equation.

Answer 1

Green colour coating seems to appear on Those copper articles that get oxidised or got corroded.

Answer 2

a copper carbonate coating is formed on them due to their rex. of Cu with CO2 H2O and O2.
and thus a layer of CuCO3.Cu(oh)2 is formed.
and formation of this green colured layer is also known as tarnishing of copper .

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