MCQ practice · SSC Chemistry Board questions · Chapter 7: Chemical Reactions
Which of the following acts as both an oxidizing and a reducing agent?
Think it through first, then pick an option.
- a Cu²⁺
- b Fe²⁺
- c Al³⁺
- d O₂
Answer and explanation
Correct answer: b Fe²⁺
Fe²⁺ → Fe³⁺ (reductant) and Fe²⁺ → Fe (oxidant) are both possible.
Why the other options are wrong
- a Cu²⁺: Cu²⁺ only takes electrons, so it is only an oxidant.
- c Al³⁺: Al³⁺ gives up no more electrons, so it cannot be a reductant.
- d O₂: O₂ accepts electrons, so it is an oxidant.
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