What change in colour is observed when copper powder is heated in a china dish also write the name of the product formed?

Text Solution

Solution : (i) The available information suggests the metal is copper. In open air, its is oxidised to form copper (II) oxide which is black in colour. The reaction is known as oxidation reaction. On passing hydrogen gas over the hot substance, the original colour of the metal is regained. It is an example of reduction reaction. <br> (ii) The balanced chemical equations for the reactions are : <br> `underset(("Metal"))(2Cu(s)) + O_(2)(g) overset("heat")rarr underset(("Black"))underset("Copper (II) oxide")(2CuO(s))` <br> `CuO(s) + H_(2)(g) overset("heat")rarrCu(s) + H_(2)O(g)`

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Answer