Oxidizing And Reducing Behavior
In acidic medium, one mole of MnO4- can oxidize Fe2+ to Fe3+ and itself gets reduced to Mn2+. Number of moles of Fe2+ oxidized per mole of MnO4- is:
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About This Question
- Subject
- chemistry
- Chapter
- d- and f-block elements
- Topic
- oxidizing and reducing behavior
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
5
In acidic solution, reduction half-reaction is: MnO4- + 8H+ + 5e- -> Mn2+ + 4H2O. Thus one mole of permanganate accepts 5 electrons. Oxidation Fe2+ -> Fe3+ + e- involves loss of one electron per Fe2+. Therefore, 5 moles of Fe2+ are oxidized by 1 mole of MnO4-. Electron balance verifies the stoichiometric coefficient as 5.
This hard difficulty chemistry question is from the chapter d- and f-block elements, covering the topic of oxidizing and reducing behavior. It appeared in the 2025 exam.
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