Some articles made of silver, copper and...

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
(ii) Copper: Colour-Green
Chemical name-Copper oxide
(iii) Iron : Colour-Reddish Brown
Chemical name -Ferric oxide.

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