1.

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. Which chemical process is responsible for these coatings. Also name the chemical formula of the black and green coatings. [3 MARKS]

Answer»

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.

Which chemical process is responsible for these coatings. Also name the chemical formula of the black and green coatings. [3 MARKS]



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