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Question

A student has been collecting silver coins and copper coins. One day she observed a black coating on silver coins and a green coating on copper coins. Which chemical phenomenon is responsible for these coatings? Write the chemical name of black and green coatings.


Solution

The phenomena responsible for the formation of a coating on copper and silver objects is known as corrosion. Silver turns black due to the formation of silver sulphide(Ag2S) while copper turns green due to the formation of a mixture of copper carbonate and copper hydroxide[(CuCO3).(Cu(OH)2)].
2Cu+CO2+H2O[(CuCO3).(Cu(OH)2)]
2Ag+H2SAg2S+H2

Science
Lakhmir Physics (2020, 2021)
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