why black coating on the surface of copper II oxide (CuO) turns brown when hydrogen gas is passed over heated copper II oxide
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Because of reduction process
cuo+H2=cu+H2O
cuo+H2=cu+H2O
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Answer:
Answer:
When Copper (Cu) is heated , the oxygen from the air combines with copper to form copper(II) oxide.
The colour of copper changes to black .
Therefore,
the coating formed on the surface of copper is copper oxide or cupric oxide (CuO).
Here is the chemical equation for the chemical reaction :-
heat
2Cu + O₂ --------------> 2CuO
This is also an example of oxidation .
Copper is the getting oxidised to CuO.
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