Q.

'X' is the number of electrons in t2g orbitals of the most stable complex ion among [Fe(NH3)6]3+, [Fe(Cl)6]3-,[Fe(C2O4)3]3- and [Fe(H2O)6]3+.  The nature of oxide of vanadium of the type V2Ox is:            [2025]

1 Acidic  
2 Neutral  
3 Basic  
4 Amphoteric  

Ans.

(4)

Because of chelation effect, [Fe(C2O4)3]3- is most stable. As C2O42- is a weak field ligand, Fe3+ (3d5) in [Fe(C2O4)3]3- splits as t2g3eg2.  Thus, [Fe(C2O4)3]3- has five unpaired electrons. V2O5 is amphoteric.