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NEETChemistryd and f Block Elements

Why is the Eo value for the Mn3+/Mn2+ redox couple much more positive than that for Cr3+/Cr2+ or Fe3+/Fe2+?

Options

  1. ABecause Mn has more d electrons
  2. BBecause Mn has a larger atomic size
  3. CBecause Mn has a much larger third ionization energy
  4. DBecause Mn has a higher melting point

Correct answer

C. Because Mn has a much larger third ionization energy

Step-by-step solution

The much larger third ionization energy of Mn is mainly responsible for the more positive Eo value for the Mn3+/Mn2+ redox couple.

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