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[Fe(H2O)6]^(3+) is strongly paramagnetic...

`[Fe(H_2O)_6]^(3+)` is strongly paramagnetic whereas `[Fe(CN)_6]^(3-)` is weakly paramagnetic. Explain.

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In both the complexes, Fe is in +3 oxidation state with the configuration `3d^(5)`. `CN^(-)` is a strong ligand. In its presence, 3d electrons pair up leaving only one unpaired electron. The hybridisation is `d^(2)sp^(3)` forming inner orbital complex. `H_(2)O` is a weak ligand. In its presence, 3d electrons do not pair up. The hybridisation is `sp^(3)d^(2)` forming an outer orbital complex containing five unpaired electrons. Hence, it is strongly paramagnetic.
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PRADEEP-CORDINATION COMPOUNDS-NCERT INTEXT QUESTIONS
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  2. Write the formulas for the following coordination compounds: (a) Tet...

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  9. Write the IUPAC names of the following coordiantion compounds: (i) [...

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  14. [Fe(H2O)6]^(3+) is strongly paramagnetic whereas [Fe(CN)6]^(3-) is wea...

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  15. Explain [Co(NH3)6]^(3+) is an inner orbital complex whereas [Ni(NH3)6]...

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  16. Predict the number of unpaired electrons in the square planar [Pt(CN)4...

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