STANDARD Chemistry Standard Electrode Potentials MCQ Question
E°{Mn³⁺/Mn²⁺} is highly positive than that of E°{Cr³⁺/Cr²⁺} or E°_{Fe³⁺/Fe²⁺} because
Mn²⁺ (d⁵) can be easily oxidised to Mn³⁺(d⁴) due to low ionisation enthalpy
Ionisation enthalpy of Mn is much larger due to stable half filled d⁵ electronic configuration of Mn²⁺
Correct Answer
Detailed Explanation
The Mn²⁺ ion has a stable half-filled d⁵ configuration, making it more favorable to oxidize to Mn³⁺, which has a less stable d⁴ configuration.
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