Question -
Answer -
Electronic configuration of Mn2+ is[Ar]18 3d5.
Electronic configuration of Fe2+ is[Ar]18 3d6.
It is known that half-filledand fully-filled orbitals are more stable. Therefore, Mn in (+2) state has astable d5 configuration. This is the reason Mn2+ showsresistance to oxidation to Mn3+. Also, Fe2+ has 3d6 configurationand by losing one electron, its configuration changes to a more stable 3d5 configuration.Therefore, Fe2+ easily gets oxidized to Fe+3 oxidationstate.