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Mn2+ is most stable due to half-filled configuration. Hence, only option (a) can be the correct answer.

1. Cr2+ = 1 1 1 1 1 1
2. Mn2+ = 1 1 1 1 1 1
3. Fe2+ = 1 1 1 1 1 1
4. Co2+ = 1 1 1 1 1 1

Correct answer: Mn2+ = 1 1 1 1 1 1

Solution

Mn2+ has a half-filled d5 configuration, which is exceptionally stable due to maximum exchange energy and symmetry. This makes it more stable compared to other options.

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