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Q.49) The correct order of the wavelength of light absorbed by the following complexes is,
A. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^3$
B. $\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}$
C. $\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^2$
D. $\left[\mathrm{Ti}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$

Choose the correct answer from the options given below:

A) $\mathrm{C}<\mathrm{A}<$ D $<$ B
 

B) $\mathrm{B}<\mathrm{D}<\mathrm{A}<\mathrm{C}$

C) - B $<$ A $<$ D $<$ C

D) $\mathrm{C}<\mathrm{D}<\mathrm{A}<\mathrm{B}$

 

Answers (1)

best_answer

 Given Complexes:
A. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+} \rightarrow \mathrm{Co}^{3+}$, ligand $=\mathrm{NH}_3 \rightarrow$ moderate field
B. $\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-} \rightarrow \mathrm{Co}^{3+}$, ligand $=\mathrm{CN}^{-} \rightarrow$ strong field $(\rightarrow$ shortest $\lambda$ absorbed $)$
C. $\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+} \rightarrow \mathrm{Cu}^{2+}$, ligand $=\mathrm{H}_2 \mathrm{O} \rightarrow$ weak field
D. $\left[\mathrm{Ti}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+} \rightarrow \mathrm{Ti}^{3+}$, ligand $=\mathrm{H}_2 \mathrm{O} \rightarrow$ weak field, but $\mathrm{Ti}^{3+}$ is $3 \mathrm{~d}^1$, causes a d-d transition at moderate $\lambda$

So the order of crystal field strength is 

B $\left(\mathrm{CN}^{-}\right)>\mathrm{A}\left(\mathrm{NH}_3\right)>\mathrm{D}\left(\mathrm{H}_2 \mathrm{O}\right)>\mathrm{C}\left(\mathrm{H}_2 \mathrm{O}\right.$ with $\left.\mathrm{Cu}^{2+}\right)$

Hence, the correct answer is (4)

Posted by

Saumya Singh

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