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For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order? (At. no. Cr=24;Mn=25&Fe=26,Co=27)

(a) Fe>Mn>Co>Cr
(b) Co>Mn>Fe>Cr
(c) Cr>Mn>Co>Fe
(d) Mn>Fe>Cr>Co

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