COMEDK · Chemistry · 23. d and f Block Elements
The \(E_{M^{3+} / M^{2+}}^o\) values for \(\mathrm{Cr}, \mathrm{Mn}, \mathrm{Fe}\) and Co are \(-0.41,+1.57,+0.77\) and +1.97 V respectively. For which of these metals, the change in oxidation state from +2 to +3 is the easiest?
- A Fe
- B Co
- C Mn
- D Cr
Answer & Solution
Correct Answer
(D) Cr
Step-by-step Solution
Detailed explanation
The oxidation of a metal ion from \(+2\) to \(+3\) state is represented by the half-reaction \(M^{2+} \rightarrow M^{3+} + e^{-}\). The standard electrode potential for this process is given by \(E_{M^{2+} / M^{3+}}^o = -E_{M^{3+} / M^{2+}}^o\). A process is easiest when the…
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