Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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Account for the following : The E° value for the Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+ couple. - Chemistry

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Account for the following : The E° value for the Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+ couple.

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Solution 1

In case of Mn '+2' oxidation state is more stable than '+3' oxidation state and in case of Cr '+3' oxidation state is more stable than '+2' oxidation state.

Solution 2

The E° value for the Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+ couple. This is because Mn2+ ion is particularly stable due to extra stability of its half filled valence electronic configuration (d5). Thus Mn3+ ion has a very high tendency to gain an electron and form the much more stable Mn2+ ion.

Concept: General Properties of the Transition Elements (D-block)
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