Identify the correct order of wavelength of light absorbed for the following complec ions
$[C o (H_{2} O)_{6}]^{3 +}; C o (C N)_{6}]^{3 -}; [C o I_{6}]^{3 -}; [C o (e n)_{3}]^{3 +} I I I I I I I V$

I I I > I > I V > I I

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I I > I V > I > I I

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I I I > I > I I > I V

No worries! We‘ve got your back. Try BYJU‘S free classes today!

I > I I I > I V > I I

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Solution

The correct option is A $I I I > I > I V > I I$
Stronger is the ligand, greater will be the crystal field splitting and lower will be the wavelength of light absorbed.

The increasing order of the crystal field splitting(as per the ligand strength according to spectrochemical saries) is $C N^{-} > e n > H_{2} O > I^{-}$

And the order of wavelength absorbed by the respective ligands iss $C N^{-} < e n < H_{2} O < I^{-}$
Hence the deceasing order of the wavelengths of light absorbed by the complex ion is $I I I > I > I V > I I$

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Similar questions

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

\begin{matrix} [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 & I I & I I I & I V \end{matrix}

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:

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

C o^{3 +}

is:

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Identify the correct order of wavelength of light absorbed for the following complec ions [Co(H2O)6]3+;Co(CN)6]3−;[CoI6]3−;[Co(en)3]3+ I II III IV

Identify the correct order of wavelength of light absorbed for the following complec ions
$[C o (H_{2} O)_{6}]^{3 +}; C o (C N)_{6}]^{3 -}; [C o I_{6}]^{3 -}; [C o (e n)_{3}]^{3 +} I I I I I I I V$