Question

a reddish brown coloured metal,used in electrical wires, when powdered and heated strongly in an open china dish it's colour turns black. when hydrogen gas is passed over this black substance it's regains it's original colour. based on above information answer the following question(1) name the matal and black coloured substance formed
(2) write balanced chemical equation for both the equation

Answer 1

Explanation:

(i) The brown colour metal is copper (Cu) . And it's black colour oxide is Copper Oxide .

(ii) Csse 1)

.Cu + O2 ----> CuO

Case 2)

CuO + H2 ------> Cu + H2O

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