A student has been collecting silver coins and and Copper Coins. One day he observed a black coating on Silver Coins and green Coating on Copper Coins. Give the Chemical Name of black and green Coating. How are they formed.
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Formula for black coating -Ag2S Silver Chloride
And formula for green coating- CuCO3 Copper Carbonate
manojmanu03032003:
how they formed?
Sorry it's silver sulphide it is formed when silver reacts with hydrogen sulphide H2S
And Copper carbonate is formed when copper reacts with H20 ,C02 and 02 resulting in formation of CU(0H)2 and CUCO3
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Explanation:
The phenomenon is called corrosion (oxidation). Black coating on silver coins is silver sulphide. Green coating on copper coins is basic copper oxide.
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