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Why do silver articles turns blackish wh...

Why do silver articles turns blackish while copper vessels turn greenish on keeping it in air for a long time ?

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(i) On exposure to air, Silver articles turn blackish after sometime because of the layer of silver sulphide `(Ag_(2)S)` formed by the reaction of silver with hydrogen slphide in the air.
(ii) Carbon dioxide in moist air react with the surface of copper vessel and these copper vessels turn greenish because of the formation of copper carbonate `(CuCO_(3))` on its surface.
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