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Why is the E value for Mn3+/Mn2+ much more positive than for Cr3+/Cr2+?
ALarge hydration of Mn3+
BSmall third IE of Mn
CLow atomisation of Mn
DLarge third IE of Mn
Answer & Solution
Correct answer: D. Large third IE of Mn
Forming Mn3+ means breaking the stable d5 set of Mn2+, so the third ionisation energy of Mn is very large.
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