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Copper exists as[[1]] in nature.

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answer is CU2S.

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Detailed Solution

Metals which are low in the activity series are very unreactive in nature. For example: mercury, copper, silver and gold. Copper exists as Cu₂S. Copper can be obtained from its ore just by heating it in the air. The reaction is as follows:

2Cu₂S (s) + 3O₂ (g) → 2Cu₂O (s) + 2SO₂ (g)

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