When copper metal reacts with oxygen, it forms

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Copper sulphate

Copper nitrate

Magnesium oxide

Copper oxide

answer is C.

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Detailed Solution

When copper metal reacts with oxygen it forms the black copper oxide.
This is an oxidation reaction. “Oxidation refers to addition of oxygen or removal of hydrogen in a substance”. The reaction when copper reacts with oxygen is

2 Cu + O_{2} \to 2 CuO

If hydrogen gas is passed over black copper oxide, copper oxide reacts with hydrogen gas to form the copper metal and water.

CuO + H_{2} \to Cu + H_{2} O

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