Silver coin became black coating what chemical phenomenon
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When silver reacts with Hydrogen Sulphide present in the air it forms a layer of Silver Sulphide which is black in colour. When Copper Metal is exposed to moist air it forms a layer of basic Copper Carbonate which is green in colour. the phenomenon responsible is corrosion.
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Silver coin become black because of reaction between silver and sulphur present in atmosphere which forms silver sulphide
Ag + S = AgS
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