For the four successive transition elements (Cr, Mn, Fe and Co), what is the order of stability of their +2 states?

(At. Nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

Cr>Mn>Co>Fe

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Mn>Fe>Cr>Co

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Fe >Mn>Co>Cr

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Co >Mn>Fe >Cr

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Solution

The correct option is B
Mn>Fe>Cr>Co

More the number of unpaired electrons more will be the stability.
Hence, the correct order is, Mn >Fe >Cr>Co.

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