1.

Which of the following ionsis paramagnetic?

Answer»

`[Ni(H_(2)O)_(6)]^(2+)`
`[Fe(CN)_(6)]^(4-)`
`[Ni(CO)_(4)]`
`[Ni(CN)_(4)]^(2-)`

Solution :In `[Ni(CO)_(4)]`

Strong field ligands like `CO, CN^(-)` generally result in inner orbital complexes.
In `[Ni(H_(2)O_(6)]^(2+), H_(2)O` is a weak field ligand, pairing of electrons will not TAKE place. Hence `[Ni(H_(2)O)_(6)]^(2+)` is PARAMAGNETIC in NATURE.


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