Which one of the following reducing agents can also act as an oxidizing agent? निम्नलिखित अपचायकों में से कौन सा एक उपचायक की तरह भी कार्य कर सकता है?

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Which one of the following reducing agents can also act as an oxidizing agent? निम्नलिखित अपचायकों में से कौन सा एक उपचायक की तरह भी कार्य कर सकता है?