Which of the following complexes will absorb | vedclass

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(C) The wavelength of light absorbed $(\lambda)$ is inversely proportional to the crystal field splitting energy $(\Delta_o)$.
$\lambda \propto \frac

Vedclass · Accepted Answer

$[CoCl(NH_3)_5]^{2+}$

Vedclass · Answer

(C) The wavelength of light absorbed $(\lambda)$ is inversely proportional to the crystal field splitting energy $(\Delta_o)$.
$\lambda \propto \frac{1}{\Delta_o}$.
To absorb the maximum wavelength,the complex must have the minimum crystal field splitting energy $(\Delta_o)$.
According to the spectrochemical series,the strength of ligands is: $CN^{-} > NH_3 > H_2O > Cl^{-}$.
Among the given ligands,$Cl^{-}$ is the weakest ligand,which results in the smallest $\Delta_o$ value.
Therefore,the complex $[CoCl(NH_3)_5]^{2+}$ will have the minimum $\Delta_o$ and will absorb the maximum wavelength of light.

Which of the following complexes will absorb the maximum wavelength of light?

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