1.

In complexes more stability is shown by :

Answer»

`[FE(H_(2)O)_(6)]^(3+)`
`[Fe(CN)_(6)]^(3-)`
`[Fe(C_(2)O_(4))_(3)]^(3-)`
`[Fe(CL)_(6)]^(3-)`

Solution :`[Fe(C_(2)O_(4))_(3)]^(3-)` is more stable due to chelation.


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