Substances that lose electrons are called ___________ agents.

• A. Oxidizing
• B. Inert
• C. Neutral
• D. Reducing

Answer: (D)

In redox chemistry, the role of a substance that loses electrons is the reducing agent. When a substance donates electrons, it becomes oxidized, and that donation drives the reduction of another species. So the substance that loses electrons is the one causing reduction in the other material, hence it is called the reducing agent. An oxidizing agent would be the partner that accepts electrons, not the one that loses them. Inert substances don’t participate in electron transfer, and neutral describes a charge state, not the chemical role in electron donation. A classic example is zinc metal reducing copper(II) ions: zinc donates electrons to Cu2+, is oxidized to Zn2+, and Cu2+ is reduced to Cu; zinc acts as the reducing agent.