A student has been collecting silver coins and copper coins.
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 names of black and green coatings.
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Silver gets tarnished when exposed to the atmosphere which contains pollutant H2S and forms a black coating of Ag2S.
Copper forms a green deposit on its surface when exposed to moist air. This is usually basic copper (II) sulphate.
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