SATHEE: Coordination Compounds - Result Question 42

Coordination Compounds - Result Question 42

####45. Correct increasing order for the wavelengths of absorption in the visible region the complexes of $C o^{3 +}$ is :-

[2017]

(a) $[C o (H_{2} O)_{6}]^{3 +}, [C o (e n)_{3}]^{3 +}, [C o (N H_{3})_{6}]^{3 +}$

(b) $[C o (H_{2} O)_{6}]^{3 +}, [C o (N H_{3})_{6}]^{3 +}, [C o (e n)_{3}]^{3 +}$

(d) $[C o (e n)_{3}]^{3 +}, [C o (N H_{3})_{6}]^{3 +}, [C o (H_{2} O)_{6}]^{3 +}$

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Solution:

(d) The order of strength of ligand is

en $> N H_{3} > H_{2} O$

For strong ligand, the value of $Δ_{0}$ for the complex is higher.

Hence, the increasing order of wavelengths of absorption is:

$[C o (en)_{3}]^{3 +} < [C o (N H_{3})_{6}]^{3 +} < [C o (H_{2} O)_{6}]^{3 +}$

Higher value of $Δ_{0}$ means higher stability, which means it will absorb high energy photons. High energy photons have low value of wavelength.

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Coordination Compounds - Result Question 42

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