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In the extraction of copper from its sulphide ore, the metal finally obtained by the reduction of cuprous oxide with:

1. iron (II) sulphide
2. carbon monoxide
3. copper (I) sulphide
4. sulphur dioxide

Correct answer: copper (I) sulphide

Solution

In the extraction of copper from its sulphide ore, cuprous oxide (Cu2O) is reduced by copper (I) sulphide (Cu2S) in a self-reduction process, forming metallic copper and sulphur dioxide.

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