List in tabular form,the change in colour observed and the name of the compound formed when silver,copper and iron are said to be corroded
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silver forms a black coating known as silver sulphide (Ag2S) . and when copper is corroded it forms a green layer known as basic copper carbonate {CuCo3.Cu(OH)2} . and the product of corrosion of iron is Fe(OH)2
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Silver usually forms a black coating or greenish layer of oxide or sulphide. It gets tarnished to be particular. It is called silver oxide (Ag2O) and is black and silver sulphide (Ag2S) is greenish. Similar phenomena is observed for copper
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