Which one of the following is a reducing substance?

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Oxygen

Iron

Potassium permanganate

Potassium dichromate

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This question was previously asked in

UPSC CISF-AC-EXE – 2017

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Iron is a reducing substance.

A reducing substance (or reductant) is a species that loses electrons in a redox reaction, causing another substance to be reduced while itself being oxidized. Iron can readily lose electrons to form Fe²⁺ or Fe³⁺ ions, thus acting as a reducing agent.

Oxygen, Potassium permanganate (KMnO₄), and Potassium dichromate (K₂Cr₂O₇) are typically strong oxidizing agents, meaning they readily gain electrons from other substances, causing the other substance to be oxidized while they themselves are reduced.

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