Verified Solution • 2025–26 Session moderate

QNEET-2024-Ch-48: NEET 2024 Chemistry - Class 12 NEET-2024-Ch-48 Solution: The \(E^ \) value for the \(Mn^{3+}/Mn^{2+}\) couple is more…

The E∘E^\circ value for the Mn3+/Mn2+Mn^{3+}/Mn^{2+} couple is more positive than that of Cr3+/Cr2+Cr^{3+}/Cr^{2+} or Fe3+/Fe2+Fe^{3+}/Fe^{2+} due to change of d5d^5 to d4d^4 configuration d5d^5 to d2d^2 configuration d4d^4 to d5d^5 configuration d3d^3 to d5d^5 configuration

Multiple Choice Options

  • A d5d^5 d 5 to d4d^4 d 4 configuration
  • B d5d^5 d 5 to d2d^2 d 2 configuration
  • C d4d^4 d 4 to d5d^5 d 5 configuration
  • D d3d^3 d 3 to d5d^5 d 5 configuration

Step-by-Step Verified Solution

E Mn 3 + / Mn 2 + 0 > E Cr 3 + / Cr 2 + _  or  E Fe 3 + / Fe 2 + _ Electronic configuration of Mn 3 + = [ Ar ] 3 d 4 Electronic configuration of Mn 2 + = [ Ar ] 3 d 5 Electronic configuration of Cr 3 + = [ Ar ] 3 d 3 Electronic configuration of Cr 2 + = [ Ar ] 3 d 4 As Mn 3 + from d 4 configuration goes to more stable d 5 configuration (Half filled), due to more exchange energy in d 5 configuration.

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