Four successive members of the first row transition elements are …

MCQ

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 $E^o_{M^{3+} /M^{2+}}$ value ?

A
$Cr\,(Z=24)$
B
$Mn\,(Z = 25)$
C
$Fe\,(Z=26)$
✓
$Co\,(Z = 27)$

✓

Answer

Correct option: D.

$Co\,(Z = 27)$

d
$E^{0}_{C r^{3+} / C r^{2+}}=\,-\,0.41\, V $

$\mathrm{E}^{0}_{\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}}=+0.77 \,\mathrm{V}$

$\mathrm{E}^{0}_{\mathrm{Co}^{3+} / \mathrm{Co}^{2+}}=+1.97\, \mathrm{V}$

$E^{0}_{\mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}}=+1.57\, \mathrm{V}$

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