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You might have noted that when copper powder is heated in a china dish, the surface of copper powder becomes coated with a black colour

You might have noted that when copper powder is heated in a china dish, the surface of copper powder becomes coated with a black colour substance.
(i) How has this black coloured substance formed?
(ii) What is that black substance?
(iii) Write the chemical equation of the reaction that takes place.

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