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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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Answer» (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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