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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?

1. Mn > Fe > Cr > Co
2. Fe > Mn > Co > Cr
3. Co > Mn > Fe > Cr
4. Cr > Mn > Co > Fe

Correct answer: Mn > Fe > Cr > Co

Solution

The stability of the +2 oxidation state depends on the electronic configuration and the relative ease of losing electrons. Mn has a half-filled d5 configuration in the +2 state, making it the most stable, followed by Fe, Cr, and Co.

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