1.

Among the following complexes, the one which shows zero crystal field stabilization energy (CFSE) is

Answer»

`[Mn(H_(2)O)_(6)]^(3+)`
`[Fe(H_(2)O)_(6)]^(3+)`
`[Co(H_(2)O)_(6)]^(2+)`
`[Co(H_(2)O)_(6)]^(3+)`

Solution :`H_(2)O` is a weak field LIGAND. Hence,
`Delta_(0) lt` PAIRING ENERGY.
CFSE = `(-0.4x+0.6y) Delta_(0)`
where x and y are no. of electrons OCCUPYING `t_(2g)` and `e_(g)` orbitals respectively.
For `[Fe(H_(2)O)_(6)]^(3+)` complex ion, `Fe^(3+)(3d^(5)) = t_(2g)^(3) e_(g)^(2)`
`therefore CFSE=-0.4xx3+0.6xx2=0Dq`


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