The d- and f-Block Elements — Chemistry STD 12 Science — Question
Bihar BoardEnglish MediumSTD 12 ScienceChemistryThe d- and f-Block Elements2 Marks
Question
Why are Mn2+ compounds more stable than Fe2+ towards oxidation to their +3 state?
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Answer
The electronic configuration of Mn2+ [Ar] 3d5 which is more stable due to half filled subshell, hence Mn+2 does not give electrons easily, that is, it has less tendency to get oxidized. But the electronic configuration of Fe+2 is [Ar] 3d6, hence it forms 3d stable configuration by giving one electron, hence it gets easily oxidized. $\underset{\left(3 d^5\right) \text { stable }}{ Mn ^{2+}} \xrightarrow{- e ^{-}} \underset{\left(3 d^4\right)}{ Mn ^{3+}}$ $\underset{\left(3 d^6\right)}{ Fe ^{2+}} \xrightarrow{- e ^{-}} \underset{\left(3 d^5\right) \text { more stable }}{ Fe ^{3+}}$
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