Answer:
E.C. of Mn2+ [18Ar] 3d5 (Stable configuration)
E.C. of Fe2+; [18Ar] 3d6.
Since Mn2+ has stable half filled electronic configuration, therefore Mn2+ compounds are more stable than Fe2+ towards oxidation to their +3 state. Fe2+(3d6) can lose one electron easily to give Fe3+(3d5, stable configuration).
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