Question

U ng HUVU MUUU
e reddish brown surface of copper powder be
ostance.
Why has this black substance formed ?
tance ?​

Answer 1

Answer:

Due to the reaction between reddish brown surface of copper with air cupric oxide (CuO) is formed which is black in colour.

Explanation:

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Answer 2

Answer:

The black coloured substance is copper oxide. It has formed due to reaction of copper with oxygen.