A blak colour is formed in Ag .if it kept outside for a long time.why?
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Explanation:
that black layer is due to the corrosion of silver. Silver combines with sulphur to form silver sulphide.
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Answer:
Hydrogen Sulphide(H2S) present in the atmosphere reacts with the silver to form Silver Sulphide (AgS) which is black in colour. This is a kind of corrosion of the metal.
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