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Q53 (CISF/2017) Science & Technology › Basic Science (Physics, Chemistry, Biology)

Which one of the following is a reducing substance ?

Result
Your answer: —  ·  Correct: B

Explanation

A reducing substance (or reducing agent) is a chemical species that donates electrons to another substance in a redox reaction, thereby undergoing oxidation itself. Metals are generally good reducing agents because they have a tendency to lose electrons.

  • Iron (Fe): As a metal, iron can lose electrons (e.g., Fe → Fe2+ + 2e−) to reduce other substances, making it a reducing agent.
  • Oxygen (O2): Is a classic oxidizing agent; it gains electrons during reactions.
  • Potassium permanganate (KMnO4): Is a very powerful oxidizing agent, where Manganese is in its highest oxidation state (+7).
  • Potassium dichromate (K2Cr2O7): Is another strong oxidizing agent commonly used in laboratories, with Chromium in the +6 oxidation state.
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