| Among the statements (a)-(d), the incorrect ones are |
| Octahedral Co(III) complexes with strong field ligands have very high magnetic moments |
| When\[{{\Delta }_{0}}<P,\]the d-electron configuration of Co(III) in an octahedral complex is \[t_{eg}^{4}\,e_{g}^{2}\] |
| Wavelength of light absorbed by \[[Co{{(en)}_{3}}]{{\,}^{3+}}\]is lower than that of \[[Co{{F}_{6}}]{{\,}^{3-}}\] |
| If the \[{{\Delta }_{0}}\] for an octahedral complex of Co(III) is \[18,000,\,c{{m}^{1}}\] the\[{{\Delta }_{t}}\] for its tetrahedral complex with the same ligand will be \[16,000\text{ }c{{m}^{1}}\] |
A) (c) and (d) only
B) (a) and (d) only
C) (a) and (b) only
D) (b) and (c) only
Correct Answer: B
Solution :
[b] \[C{{o}^{3+}}\]with strong field complex forms low magnetic moment complex If \[{{\Delta }_{0}}<P\] configuration of \[~C{{o}^{3+}}\] will be \[t_{g}^{6}\,e_{g}^{2}\] CFSE of \[{{[Co{{(en)}_{3}}]}^{3+}}\]is more than \[{{[Co{{F}_{6}}]}^{3-}}\] \[\Rightarrow \,\,{{\lambda }_{absorbed}}\] of \[{{[Co{{(en)}_{3}}]}^{3+}}\] is less than \[{{[Co{{F}_{6}}]}^{3-}}\] \[{{\Delta }_{t}}=\frac{4}{9}\,{{\Delta }_{0}}=\frac{4}{9}\,\times 18000=18000\,c{{m}^{-\,1}}\] Hence, and are incorrect
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