Same chapter3 marksDifficulty: Medium
Why are most transition metal compounds coloured?
d- and f-Block Elements
3 marksDifficulty: Medium
Why is Mn2+ more stable than Fe2+ towards oxidation?
Original Khojo Papers practice question — not from a past board paper.
Answer
Mn2+ has the configuration 3d5, a half-filled subshell that is unusually stable, so removing a further electron is difficult. Fe2+ is 3d6, and losing one electron gives it the stable half-filled 3d5 arrangement, so it is readily oxidised to Fe3+.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
This is why iron(II) salts are used as reducing agents while manganese(II) salts are not.
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