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 hydrogen gas
is passed over this black substance, it regains its original colour. Based on the above information, answer the following questions:
(1) Name the metal and the black coloured substance
formed.
(ii) Write balanced chemical equations for both the
reactions.
​

Answer 1

Explanation:

a) The metal is COPPER and the the black coloured substance formed is COPPER OXIDE.

b) 2Cu + O2 = 2CuO

CuO + H2 = Cu + H2O