JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
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 \(Fe\,(Z=26)\)
- D \(Co\,(Z = 27)\)
Answer & Solution
Correct Answer
(D) \(Co\,(Z = 27)\)
Step-by-step Solution
Detailed explanation
\(E^{0}_{C r^{3+} / C r^{2+}}=\,-\,0.41\, V \) \(\mathrm{E}^{0}_{\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}}=+0.77 \,\mathrm{V}\) \(\mathrm{E}^{0}_{\mathrm{Co}^{3+} / \mathrm{Co}^{2+}}=+1.97\, \mathrm{V}\) \(E^{0}_{\mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}}=+1.57\, \mathrm{V}\)
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