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Among the following, the most stable com...

Among the following, the most stable complex is
(i). `[Fe(H_2O)_6]^(3+)`
(ii). `[Fe(NH_3)_6]^(3+)`
(iii). `[Fe(C_2O_4)_3]^(3-)`
(iv). `[FeCl_6]^(3-)`

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Verified by Experts

In each of the given complex Fe is in +3 oxidation state As `C_(2)O_(4)^(2-)` is didentate chelating ligand it forms chelate rings and hence (iii) out of complexes given above is the most stable complex.
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Amongst the following , the most stable complex is : (a) [Fe(H_(2)O)_(6)]^(3+) (b) [Fe(NH_(3))_(6)]^(3+) (c) [Fe(C_(2)O_(4))_(3)]^(3-) (d) [FeCl_(6)]^(3-) .

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