'' is the number of electrons in orbitals of the most stable complex ion among , , and . The nature of oxide of vanadium of the type is:

Question

'' is the number of electrons in  orbitals of the most stable complex ion among , ,  and . The nature of oxide of vanadium of the type  is:

Canvas Classes · Accepted Answer

Strategy:
 Evaluate the thermodynamic stability of the complexes based on ligand field strength and specifically the chelate effect. Then, find the  count and map it to an unknown Vanadium oxide to find its acid-base nature.

Step 1: Find the most stable complex ion
All complexes contain the  () ion.
Stability heavily relies on the chelate effect.  contains three bidentate oxalate ligands that form multiple extremely stable 5-membered rings around the iron center. Additionally, oxalate provides

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