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Question
Give reasons for the following:
E⁰ value for (Mn3+|Mn2+) is highly positive than that for (Cr3+|Cr2+) couple.
Short/Brief Note
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Solution
Much larger third ionisation energy of Mn (where the required change is d5 to d4) is mainly responsible for high E⁰ value for (Mn3+|Mn2+) couple than that for (Cr3+|Cr2+) couple.
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