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Find CFSE of [Fe(H(2)O(6))]^(2+) and [Ni...

Find `CFSE` of `[Fe(H_(2)O_(6))]^(2+)` and `[NiCl_(4)]^(2-)`

A

`-0.4 Delta_(0) and -1.2 Delta_(t)`

B

`-0.4 Delta_(0) and -0.8 Delta_(t)`

C

`-2.4 Delta_(0) and -1.2 Delta_(t)`

D

`-0.6 Delta_(0) and -0.8 Delta_(t)`

Text Solution

Verified by Experts

The correct Answer is:
B
CFSE
Of `underset("Octahedral Complex")([Fe(H_(2)O)_(6)]) Cl_(2)`
`H_(2)O` weak field Ligand
i.e, do not pair up the unpaired electron
`[Fe(H_(2)O)_(6)]^(+2)`
`Fe^(+2) 1s^(2) 2s^(2) 2p^(2) 3s^(2) 3p^(6) 3d^(6)`
CFSE `-4 xx 0.4 Delta_(0) + 2 xx 0.6 Delta_(0)`

`=-1.6 Delta_(0) + 1.2 Delta_(0)`
`=-0.4 Delta_(0)`
`K_(2) [NiCl_(4)]`
`[underset(Ni^(+2))(NCl_(4))]^(-2) underset(sp^(3)) ("Tetrahedral Complex")`
`Cl^(-) rArr` weak field Ligand do not pair up
`Ni^(+2) 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(8)`
CFSE `=-0.6 xx 4 Delta_(t) + 0.4 xx 4 Delta_(t) = -2.4 Delta_(t) + 1.6 Delta_(t)`
`CFSE = -0.8 Delta_(t)`
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