A student has been collecting silver coins and copper coins. One day she observed a black coating on silver coins and green coating on copper coins. Which chemical phenomenon is responsible for these coating? Write the chemical name of black and green coatings.
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Answer:
The phenomenon is known as corrosion. Air contains traces of hydrogen sulphide gas which reacts with silver metal present in the coin to form silver sulphide. It is black in colour
Explanation:
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Answer:
siddhartharao77 Genius
Black coating on silver coins is due to silver sulphide(Ag2s).
2 Ag(s) + H2S(g) ----- Ag2S(s) + H2(g).
Green Coating on copper coins is due to copper carbonate and copper hydroxide.
2 Cu + H2O + CO2 + O2 ------ > Cu(OH)2 + CuCO3
Hope this helps.
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