| Which one of the following ions is the most stable in aqueous solution? [AIPMT (S) 2007] |
| (At. no. Ti = 22, V - 23, Cr = 24, Mn = 25) |
A) Cr3+
B) V3+
C) Ti3+
D) Mn3+
Correct Answer: D
Solution :
| [d] Stability of transition metal ion is directly proportional to the unpaired electron. The exactly half filled and completely filled d-orbirals are extra stable. |
| Cr3+(21)= 3d34s0 - 3 unpaired electrons |
| V3+ (20) = 3d2 4s0 - 2 unpaired electrons |
| Ti3+ (19) = 3d14s0 - 1 unpaired electron |
| Mn3+ (22) = 3d4 4s0 - 4 unpaired electrons |
| So, Mn3+ ion is most stable in aqueous solution. |
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