Q. 75.0( 4 Votes )

A reddish brown c

Answer :

(i) The brown colour metal is copper (Cu) and black coloured substance is Copper oxide (CuO).

(ii) (a) When Cu metal is heated in an open china dish then Cu metal gets oxidised

Cu + O2 2CuO

(b) When hydrogen gas is passed over the black substance then CuO gets reduced

CuO + H2 Cu + H2O

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