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The highly stable pair of ions are

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Fe²⁺ and Fe³⁺

Fe³⁺ and Fe⁴⁺

Fe³⁺ and Mn²⁺

Fe²⁺ and Mn³⁺

answer is C.

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Detailed Solution

Fe³⁺ : [Ar]4s⁰3d⁵

Mn²⁺ : [Ar]4s⁰3d⁵

Because of half filled configurations these are highly stable.

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