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Q.

When copper metal reacts with oxygen, it forms


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a

Copper sulphate

b

Copper nitrate

c

Copper oxide

d

Magnesium oxide  

answer is C.

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Detailed Solution

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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               2Cu + O2  → 2CuO
If hydrogen gas is passed over black copper oxide, copper oxide reacts with hydrogen gas to form the copper metal and water.
              CuO   +   H2   →   Cu   +   H2O  
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