Give reasons :E° value for Mn3+/Mn2+ couple is much more positive tha

1.	Give reasons :E° value for Mn3+/Mn2+ couple is much more positive than that for Fe3+/Fe2+.
Answer» The comparatively high value for Mn shows that Mn²⁺(d⁵ ) is particularly stable / Much larger third ionisation energy of Mn (where the required change is from d⁵ to d⁴ ). Detailed Answer : (a) Because Mn²⁺ is more stable than Mn³⁺ due to half-filled d⁵ configuration whereas Fe²⁺ becomes unstable after loosing an electron from half filled orbital.

Give reasons :E° value for Mn3+/Mn2+ couple is much more positive than that for Fe3+/Fe2+.

Answer»

The comparatively high value for Mn shows that Mn²⁺(d⁵ ) is particularly stable / Much larger third ionisation energy of Mn (where the required change is from d⁵ to d⁴ ).

Detailed Answer :

(a) Because Mn²⁺ is more stable than Mn³⁺ due to half-filled d⁵ configuration whereas Fe²⁺ becomes unstable after loosing an electron from half filled orbital.

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Give reasons :E° value for Mn3+/Mn2+ couple is much more positive than that for Fe3+/Fe2+.

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