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Which of the following behaves as both o...

Which of the following behaves as both oxidising and reducing agents ?

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(i) Oxygen is being added to Cu,(ie.,) `Cu_2S` is oxidised to `Cu_2O` and the other reactant `O_2` is getting reduced.
(ii) `Cu_2S` is the a reducing agent . `O_2` is an oxidising agent .
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