Question

a reddish brown coloured metal used in electrical wires, when powdered and heated strongly in an open china dish, its colour turns black when htdrogen gas is passesd over this black substance, it regains its original colour. (a).name the metal and black coloured substance formed. (b)write balanced chemical equation for both the reactions​

Answer 1

the reddish brown coloured metal used in electric wire is copper

Answer 2

(a) this metal is copper (cu)

and black computer substance former is CuO (copper oxide )

(b) (i)2Cu + O2 ---------- 2CuO

(ii) CuO + H2 ----------Cu + H2O

hope it helps u ......mate ......