A numismatist ( coin collector ) has been collecting gold coins, silver coins and copper coins for a long time . One day he observed a black coating on silver coins and green coating on copper coins . What chemical process is responsible for These coatings . Also name the chemical formula of the black and green coatings .
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Step-by-step explanation:
The green coating formed on the copper when it is exposed to air is a mixture of copper carbonate - CuCO3 and copper hydroxide - Cu(OH)2.
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