Which of the following items does NOT characterize a reducing agent?

Question

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A good reducing agent is typically a substance that readily donates electrons, not necessarily a metal in a high oxidation state. Metals in high oxidation states are generally more likely to accept electrons (acting as oxidizing agents), whereas metals in low oxidation states or alkali metals like Na, which readily lose electrons, are more likely to act as reducing agents.

Which of the Following Items Does NOT Characterize a Reducing