Question

When copper powder is heated it gets coated with a)Black copper oxide b)Yellow copper oxide c)Red copper oxide d)None of these

Answer 1

a) black copper oxide

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Answer 2

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 a 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.