Correct increasing order for the wavelengths of absorption in the visible region for the complexes of - Co-3- is- -Co-NH-3-6-3- lt-Co-en-3-3- lt-Co-H-2O-6-3- -Co-en-3-3- lt-Co-NH-3-6-3- lt-Co-H-2O-6-3- -Co-H-2O-6-3- lt-Co-en-3-3- lt-Co-NH-3-6-3- -Co-H-2O-6-3- lt-Co-NH-3-6-3- lt-Co-en-3-3-

The correct option is B [Co(en)_3]^3+ lt;[Co(NH_3)_6]^3+, lt;[Co(H_2O)_6]^3+ The increasing order for the wavelengths of absorption in the visible reg ...

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Byju's Answer

Standard XII

Chemistry

Crystal Field Split in Octahedral Complexes

Correct incre...

Question

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

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

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

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

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

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Solution

The correct option is B $[C o (e n)_{3}]^{3 +} < [C o (N H_{3})_{6}]^{3 +}, < [C o (H_{2} O)_{6}]^{3 +}$
The increasing order for the wavelengths of absorption in the visible region for the complexes of $C o^{3 +}$ is $[C o (e n)_{3}]^{3 +} < [C o (N H_{3})_{6}]^{3 +} < [C o (H_{2} O)_{6}]^{3 +}$ .
The decreasing order of ligands strength is $e n > N H_{3} > H_{2} O$ . Stronger ligand causes greater splitting between two energy levels.
The energy of light absorbed is more and the wavelength of light absorbed is less for the stronger ligand.

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

Q. The correct increasing order of wavelengths of absorption in the visible region for the complexes of

C o^{3 +}

is:

Q. Correct increasing order for the wavelength of absorbtion in the visible region for the complexes of

C o^{3 +}

is:

The colour of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of wavelength of light in the visible region, for the complexes, $[C o (N H_{3})_{6}]^{3 +}, [C o (C N)_{6}]^{3 -}, [C o (H_{2} O)_{6}]^{3 +}$
$[C o (N H_{3})_{6}]^{3 +}, [C o (C N)_{6}]^{3 -}, [C o (H_{2} O)_{6}]^{3 +}$
(a) $[C o (C N)_{6}]^{3 -} > [C o (N H_{3})_{6}]^{3 +} > [C o (H_{2} O)_{6}]^{3 +}$
(b) $[C o (N H_{3})_{6}]^{3 +} > [C o (H_{2} O)_{6}]^{3 +} > [C o (N H_{3})_{6}]^{3 +}$
(c) $[C o (H_{2} O)_{6}]^{3 +} > [C o (N H_{3})_{6}]^{3 +} > [C o (C N)_{6}]^{3 -}$
(d) $[C o (C N)_{6}]^{3 -} > [C o (N H_{3})_{6}]^{3 +} > [C o (H_{2} O)_{6}]^{3 +}$

Q. Arrange the following cobalt complexes in the order of increasing crystal field stabilisation energy (CFSE) value.

Complexes :
A .

{[C o F_{6}]}_{6}^{3 -}

B .

{[C o {(H_{2} O)}_{6}]}_{6}^{2 +}

C .

{[C o {(N H_{3})}_{6}]}_{6}^{3 +}

D .

{[C o {(e n)}_{3}]}_{3}^{3 +}

Choose the correct option :

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Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co3+ is:

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