In aqueous solution the configuration of the ions are following Cr3+(21) V3+(20)Tr3+(19)Mn3+(22)=3d34s0⇒t2g3eg0=3d24s0⇒t282eg0=3d14s0⇒t281eg0=3d44s0⇒t2g4eg0 We know that half-filled and fully filled orbitals are more stable than partially filled orbitals. Hence among the given ions the only Cr3+ ion which occupies half-filled t2g orbitals. Caution Although Mn3+ ion has half-filled ts orbital but there is one more electron filled in eR orbital which reduces the stability.
Which one of the following ions is the most stable in aqueous solution? (At No. Ti=22, ~V=23, Cr=24, Mn= 25)
NEET UG 2007 — Chemistry Inorganic Chemistry
2007mcqhard
Which one of the following ions is the most stable in aqueous solution? (At No. Ti=22, V=23,Cr=24,Mn= 25)
Official previous-year question
Held on 30 Apr 2007 · Verified 9 Jul 2026.
Options
- A
V3+
- B
Ti3+
- C
Mn3+
- D
Cr3+
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