Electrochemistry · Class 12 · CBSE · Science Chemistry

How many faradays of electricity are required to reduce 1text{ mole} of MnO4^- to Mn^{2+} in acidic medium?

Practice question from Electrochemistry (Class 12 · CBSE · Science Chemistry), with the correct answer and a step-by-step solution.

medium · MCQ · Q-C3C8F6

How many faradays of electricity are required to reduce 1 mole1\text{ mole} of \MnO4−\MnO_4^- to \Mn2+\Mn^{2+} in acidic medium?

  1. A.1 F1\text{ F}
  2. B.3 F3\text{ F}
  3. C.5 F5\text{ F}Correct answer
  4. D.7 F7\text{ F}

Solution

In acidic medium, the reduction of permanganate is \MnO4−+8H++5e−→Mn2++4H2O\MnO_4^- + 8H^+ + 5e^- \rightarrow Mn^{2+} + 4H_2O. Since 5 moles5\text{ moles} of electrons are required per mole of \MnO4−\MnO_4^-, 5 Faradays5\text{ Faradays} of electricity are needed.

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