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No reducing agent is required in the ext...

No reducing agent is required in the extraction of copper - explain why.

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In the extraction of copper, the ore is at first roasted, followed by smelting, which forms the matte. The molten matte is then oxidised in controlled airflow in a Bassemer converter. `FeS` present in the matte is oxidised to `FeO` and `Cu_(2)S` is partially oxidised to form `Cu_(2)O`. Since `Cu_(2)O` and the remaining `Cu_(2)S` undergo self reduction and produces `Cu,` external reducing agent is not required.
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