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Some articles made of silver, copper and iron get coloured coating over then

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asked Mar 26, 2018 in Science by Golu (37,045 points) ● 19 ● 174 ● 632
Some articles made of silver, copper and iron get coloured coating over then when they are exposed to air. Identify the colour and chemical name of the substance of coating in each case

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answered Mar 26, 2018 by BISHNU (15,580 points) ● 4 ● 4 ● 6
selected Mar 28, 2018 by faiz
 
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(i) Silver : Colour – Black
Chemical name – Silver sulphide
(ii) Copper : Colour – Green
Chemical name – Copper oxide
(iii) Iron : Colour – Reddish brown
Chemical name – Ferric oxide
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