Question

What happens when :

(i) Copper carbonate is heated ?

(ii) Copper oxide is heated in atmosphere of hydrogen gas?

Answer 1

1) When copper carbonate is heated it decomposes to liberate carbon dioxide gas and a black residue of copper oxide.

CuCO₃ $\stackrel{HEAT}{\to }$ CuO + CO₂

2)

Copper Oxide when heated in atmosphere of Hydrogen it reduces in elemental copper with release of water vapours.The chemical reaction for this process is:

CuO + H₂ → Cu + H₂O

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