The correct order of the wavelength of light absorbed by the following complexes is, [2025]

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Solution

Q.
The correct order of the wavelength of light absorbed by the following complexes is,

A. ${[Co {({NH}_{3})}_{6}]}^{3 +}$
B. ${[Co {(CN)}_{6}]}^{3 -}$
C. ${[Cu {(H_{2} O)}_{4}]}^{2 +}$
D. ${[Ti {(H_{2} O)}_{6}]}^{3 +}$

Choose the correct answer from the options given below: [2025]

1 C < D < A < B

2 C < A < D < B

3 B < D < A < C

4 B < A < D < C

Ans.
(4)

Stronger is the strength of the ligand, greater is the splitting and higher is the energy absorbed by the complex.

As $E = \frac{h c}{λ} or E \propto \frac{1}{λ}$

So, wavelength of light absorbed is inversely proportional to the strength of the ligand.

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