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In the Auto oxidation taking place in Be...

In the Auto oxidation taking place in Bessemer converter during the extraction of copper. The change in oxidation state of sulphur in this process is

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Reaction in the Bessemer converter is `2Cu_(2)O+Cu_(2)S rarr 6Cu+SO_(2)`.
In the auto-reduction reaction, sulphide ion is reductant and cuprous ion is oxidant.
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