Consider the following complexes:
(A) [Co(CN)$_6$]$^{3-}$
(B) [Co(NH$_3$)$_5$H$_2$O]$^{3+}$
(C) [Co(H$_2$O)$_6$]$^{3+}$
(D) [CoF$_6$]$^{3-}$
The wavelength absorbed by the above complexes are in the order:
Consider the following complexes:
(A) [Co(CN)$_6$]$^{3-}$
(B) [Co(NH$_3$)$_5$H$_2$O]$^{3+}$
(C) [Co(H$_2$O)$_6$]$^{3+}$
(D) [CoF$_6$]$^{3-}$
The wavelength absorbed by the above complexes are in the order:
Show Hint
- A>B>C>D
- A<B<C<D
- B<A<C<D
- C>A>B>D
The Correct Option is B
Solution and Explanation
\[ CN^->NH_3>H_2O>F^- \]
Step 2: Relate ligand strength to crystal field splitting.
Stronger ligand $\Rightarrow$ larger $\Delta_o$ $\Rightarrow$ shorter wavelength absorbed.
Step 3: Order of wavelength absorbed.
\[ A<B<C<D \]
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