The d and f Block elements – Solutions
1. Why are Mn2+ compounds more stable than Fe2+ compounds towards oxidation to the +3 state?
Solution
Mn2+ compounds are more stable than Fe2+ compounds towards oxidation to their + 3 state, due to half filled d-orbitals in Mn2+ , while Fe2+ gains half filled d-orbitals by losing one electron by getting oxidised to Fe3+ . Hence , Mn2+ is not oxidised easily to Mn3+ .
Fe2+ Fe3+ + e−
3d6 → 3d5
(Unstable) (Stable)
Mn2+ → Mn3+ + e−
3d5 → 3d4
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ShikshaHouse
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8 Class 12th Chemistry - The d and f Block elements - NCERT Solutions
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