Why is manganese more stable in the + 2 state than the + 3 state and t – InterviewSolution

1.	Why is manganese more stable in the + 2 state than the + 3 state and the reverse is true for iron?
Answer» The electronic configuration of Mn is ₂₅Mn [Ar] 3d⁵ 4s² In + 2 and + 3 oxidation states, the electronic configuration of Mn²⁺ is, Mn²⁺ [Ar] 3d⁵ and Mn³⁺[Ar] 3d⁴ Since half-filled d-orbital (3d5) has more stability and lower energy than 3d⁴, Mn²⁺ is more stable than Mn³⁺ The electronic configuration of Fe is ₂₆Fe [Ar] 3d⁶ 4s In + 2 and + 3 oxidation states of Fe, the electronic configuration is, Fe²⁺ [Ar] 3d⁶ and Fe³⁺ [Ar] 3d⁵ Since half-filled orbital is more stable, + 3 state of Fe is more stable than + 2 state.

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