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Q.

The E° value for the Mn3+/Mn2+ couple is more positive than that of Cr3+/Cr2+ or Fe3+/Fe2+ due
to change of

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a

d5 to d2 configuration

b

d3 to d5 configuration

c

d5 to d4 configuration

d

d4 to d5 configuration

answer is A.

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Detailed Solution

 Mn−4s23d5 Mn+3−4s02d4 Mn+2−4s03d5 ∴3d4→3d5

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