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Why is the EV value for the Mn3+/Mn2+ couple much more positive than that for Cr3+/Cr2+ or Fe3+/Fe2+? Explain.

Why is the EV value for the Mn3+/Mn2+ couple much more positive than that for Cr3+/Cr2+ or Fe3+/Fe2+? Explain.

Grade:9

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
8 years ago
Much larger third ionisation energy of Mn (where the required change
is d5 to d4) is mainly responsible for this. This also explains why the
+3 state of Mn is of little importance

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