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Some articles made of silver, copper and iron get coloured coating over them when they are . exposed to air. Identify the colour and chemical name of the substance of coating in each case.

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(i) Silver: Colour - Black

Chemical Silver sulphide

(ii) Copper: Colour - Green

Chemical name - Copper oxide

(iii) Iron: Colour - Reddish Brown

Chemical name - Ferric oxide

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