A black coloured substance is formed on the surface of copper metal when it is heated in oxygen of
air. Give reason.
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cupric oxide
Black coloured substance formed on the surface of copper metal is found to be of copper(||)oxide or cupric oxide. Actually,oxygen present in air has reacted with copper upon heating to form its oxide. because of the product formed in this reaction which is known as copper/cuprous oxide (CuO).
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