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[Fe(H(2)O(6)]^(3+) is strongly paramagne...

`[Fe(H_(2)O_(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 hybridization 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 hybridization is `sp^(3)d^(2)` forming an outer orbital complex containing five unpaired electrons. Hence, it is strongly paramagnetic
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FIITJEE-TRANSITION ELEMENTS & COORDINATION COMPOUNDS-SOLVED PROBLEMS(SUBJECTIVE)
  1. Give evidence that [Co(NH(3))(5) CI] SO(4) Clare ionization isomers

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  2. Nicl(4)]^(2-) is paramagnetic while [Ni(CO(4))] is diamagnetic though ...

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  3. [Fe(H(2)O(6)]^(3+) is strongly paramagnetic whereas [Fe(CN)(6)]^(3-) i...

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  4. Explain (Co(NH(3))(6)]^(3+) is an inner orbital complex whereas [NI(NH...

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  5. Draw the structure of optical isomers of (i) [PICl(2)] (en)(2)]^(2+) ...

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  6. What is the coordination entity formed when excess of aqueous KCN is a...

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  7. A solution of [Ni(H(2)O(6)]^(2+) is green but a solution of [Ni(CN)(4)...

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  8. [Fe(CN)(6)]^(4-) and [Fe(H(2)O)(8)]^(2+) are of different colours in d...

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  9. Amongst the following ions, which one has the highest magnetic moment ...

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  10. Fe^(3+)overset(SCN^(-)(excess))to "blood red"(A)overset(F^(-)(excess))...

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  11. A(1) & A(2) are two ores of metal M. Ar on calcination gives black pre...

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  12. Nickel chloride, when treated with dimethyl gyloxime in presence of am...

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  13. Write the IUPAC nomenclature of the given complex along with its hybri...

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  14. Deduce the structure of [Nicl(4)]^(2) and [Ni(Cl(4)]^(2-) considering ...

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  15. A metal complex having composition Cr(NH(3))(4) Cl(2)Br has been isola...

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  16. Draw the structures of [Co(NH(3))(6)]^(3+) [Ni(CN)(4)]^(2-) and [Ni(CO...

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  17. The magnetic moment of [Mn(CN)(6)]^(3-) is 2.8 B.M and that of [MnBr(4...

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  18. Why chelated complexes are more stable than unchelated complexes

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  19. The hexaaqua complex[Ni(H(2)O)(6)]^(2+) is green, whereas the correspo...

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  20. Calculate magnetic moment of Fe^(3+) in [Fe(CN)(6)]^(3+) and in [Fe(H(...

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