Question

what is the colour of copper oxide ​

Answer 1

Black

Copper Oxide isn't green. It is Black. In fact, there are two different Copper Oxides. There is Copper (I) oxide - Cu2O, which is a red colour and Copper (II) oxide - CuO that is black.

Answer 2

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Copper Oxide is black in colour.

There is Copper(I) oxide - Cu2O, which is a red colour and Copper(II) oxide - CuO that is black.