What type of coating is formed on silver articles when they get corroded give equation?
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It is called Tarnishing of Silver. It is a coating of silver sulphide which give sliver black colour. 2Ag +H2S = Ag2S +H2
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Silver objects Tarnish slowly in air, i.e. polished silver articles gradually blacken, this is due to the traces of hydrogen sulphide in air which reacts with Ag, forming black Ag2S.
It's chemical equation will be -
Ag2O + H2S --> Ag2S + H2O.
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