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d-and f-Block Elements — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryd-and f-Block Elements1 Mark
Question
Why are $Mn ^{2+}$ compounds more stable than $Fe ^{2+}$ towards oxidation to their +3 state?
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Answer

$Mn ^{2+}$ has stable electronic configuration ([Ar] $4 s^0, 3 d^5$ ) and thus does not easily change to $Mn ^{3+} . Fe ^{2+}\left[[ Ar ] 4 s^0, 3 d^6\right]$ on oxidation forms $Fe ^{3+}$ [Ar] $4 s^0, 3 d^5$ ] a more stable configuration.

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