The complex ion that will lose its crystal field stabilization energy upon oxidation of its metal to +3 state is :

Complete removal of both the axial ligands (along the z-axis) from an octahedral complex leads to which of the following splitting patterns? (relative orbital energies not on scale).

The crystal field stabilization energy (CFSE) of [Fe(H₂O)₆]Cl₂ and K₂[NiCl₄] respectively, are :

The species that can have a trans-isomer is :
(en = ehane-1, 2-diamine, ox = oxalate)