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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
10 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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