1.

Which of the following ions is diamagnetic?

Answer»

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

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

CO is a strong field and in `[Ni(CO)_(4))` complex AL the ELECTRONS in d-orital are paired. Hence `[NI(CO)_(4)]` is diamagnetic in nature.
`H_(2)O` & `Cl^(-)` are weak field ligand hence do noc cause paireing.


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