The correct increasing order of wavelengths of absorption in the visible region for the complexes of Co 3- is-A- - Co en 3-3- Co NH 36-3- Co H 2 O 6-3-B- - Co H 2 O 6-3- Co en 3-3- Co NH 36-3- - Co H 2 O 6-3- Co NH 36-3- Co en 3-3-D- - Co NH 36-3- Co en 3-3- Co H 2 O 6-3-

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Colours in Coordination Compounds

The correct i...

Question

The correct increasing order of 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 +}

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

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Solution

The correct option is A $[C o (e n)_{3}]^{3 +}, [C o (N H_{3})_{6}]^{3 +}, [C o (H_{2} O)_{6}]^{3 +}$
The order of the ligand in the spectrochemical series is $H_{2} O < N H_{3} < e n$

Hence, the wavelength of the light observed will be in the order: $[C o (H_{2} O)_{6}]^{3 +}$ < $[C o (N H_{3})_{6}]^{3 +}$ < $[C o (e n)_{3}]^{3 +}$

Thus, the wavelength absorbed will be in the opposite order.
i.e., $[C o (e n)_{3}]^{3 +}, [C o (N H_{3})_{6}]^{3 +}, [C o (H_{2} O)_{6}]^{3 +}$

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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. 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. 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 +}

Q. Identify the correct order of wavelength of light absorbed for the following complex ions.

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

I II III IV

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

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