a. On addition of silver nitrate, [Co(NH3)5 (SO4)] Cl will form white precipitate of AgCl while [Co(NH3)5CI]SO4does not. This shows that chloride ion is inside the coordination sphere in [Co(NH3)5CI]SO4 and thus the given two complexes are ionisation isomers.
b. In [Ni(CO)4], Ni is in zero oxidation state whereas [NiCl4]2-, it is in +2 oxidation state. In the presence of CO ligand the unpaired d electrons of nickel pair up but Cl- being a weak ligand is unable to pair up the unpaired electrons. So, [NiCl4]2- is paramagnetic while [Ni(CO)4] is diamagnetic though both are tetrahedral.
c. The electronic configuration of Fe(III) on the basis of crystal field theory when it forms an octahedral complex:
i. In the presence of strong field ligand: t2g5 eg0
ii. In the presence of weak field ligand: t2g3 eg2
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