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During a redox titration involving a solution containing F e 2 + ions against M n O 4 - in the presence of excess of H + ions, the number of electrons that gets transferred is

Options

  1. A6
  2. B5
  3. C4
  4. D2

Correct answer

B. 5

Step-by-step solution

For redox titration of a solution containing Fe 2 + against MnO 4 - , H + ions are present in excess i.e., the solution is acidic. Mn + 7 O 4 - +   Fe 2 + → Fe 3 + + Mn 2 +     ( acidic   medium ) Here, oxidation number of Mn is reduced from + 7   to   + 2 (reduction) and oxidation number of Fe is increased from + 2   to   + 3 (oxidation). Reduction half cell, M n O 4 - + 8 H + + 5 e - ⟶ M n 2 + + 4 H 2 O ....(equation 1) Oxidation half cell, [ F e 2 + ⟶ F

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