Rahul has been collecting copper coins and silver coins one day he observed a green coating on copper coins and black coating on Silver coins state the chemical phenomena responsible for these coatings and also write chemical names of each coating
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copper and silver coins were corroded or get oxidised and the upper greenish layer in copper and blackish layer in silver is layer of oxygen
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Your Answer is ---
One day , Rahul observed a green coating on copper because his copper reacted with moist Carbon Dioxide ( CO2 ) in the air and it slowly lost its shiny brown surface and gained a green coat. That green substance so formed was of Copper Carbonate ( CuCO3.Cu[OH]2 ).
The chemical equation for the above reaction is:--
2Cu + O2 + H2O + CO2 → Cu(OH)2.CuCO3
Rahul also observed black coating on Silver for the fact that Silver reacted with sulphur in the air and formed a black coating of Silver Sulphide ( AgS ).
The chemical equation for the above reaction is-->
Ag (s) + S (g) ---> AgS (s)
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