Silver articles become black after some ...

Silver articles become black after some time when exposed to air because

silver gets oxidized to silver oxide

silver reacts with moist carbon dioxide in the air to form silver carbonate

silver reacts with sulphur in the air to form a coating of silver sulphide

silver reacts with nitrogen oxides in the air to form silver nitrate

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Silver articles become black when kept in open for some time, whereas copper vessels lose their shiny brown surfaces and gain a green coat when kept in open. Name the substances present in air with which these metals react and write the name of the products formed.

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