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Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest E°3+/2+ value? (1) Fe (Z = 26) (2) Co (Z = 27) (3) Cr (Z = 24) (4) Mn (Z = 25)

1. Fe (Z = 26)
2. Co (Z = 27)
3. Cr (Z = 24)
4. Mn (Z = 25)

Correct answer: Co (Z = 27)

Solution

Cobalt (Co) has a higher E°3+/2+ value compared to the other elements listed because it has a more favorable electron configuration and a stronger tendency to stabilize its +2 oxidation state, making it more efficient in accepting electrons.

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