Assertion : Reduction potential of Mn ( + 3 to +2 ) is more positive than Fe ( + 3 to +2 ) . Reason : Ionisation potential of Mnis more than that of Fe .

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Mn 2 + = [ Ar ] 3 d 5 ​ Mn 3 + = [ Ar ] 3 d 4 Fe 3 + = [ Ar ] 3 d 5 ​ Fe 2 + = [ Ar ] 3 d 6 , Thus, Mn 2 + has more stable configuration than Mn 3 + while Fe 3 + has more stable configuration than Fe 2 + . Hence, reduction potential for Mn 3 + / Mn 2 + couple is more positive than Fe 3 + / Fe 2 + .

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