Question

A reddish brown coloured metal used in electrical wires when powdered and heated strongly in an pen china dish its colour turns black .When hydrogen gas is passed over rhis black substance it regains its original colour 1 name the metal and the blavk coloured substance formed 2 write balanced equations for both the reactions

Answer 1

Hey Guys,

1) The metal is Copper which is reddish brown in colour. The blacked coloured substance is cupric oxide .
2) Oxidation reaction :-
2Cu + O2 = 2CuO

Reduction reaction :-
2CuO + 2H2 = 2Cu + 2H2O

Thanks.