The complex ion having minimum magnitude of $△_{0}$ (CFSE) in octahedral field is:

[C o C l_{6}]_{3 -}

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

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

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

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Solution

The correct option is A $[C o (C N)_{6}]^{3 -}$
The complex ion having the maximum magnitude of $Δ_{o}$ (CFSE) in octahedral field depends on position of ligand in spectrochemical series. Among the given ligands coordinated to metal ion $C N^{-}$ is higher in the series and hence $[C o (C N)_{6}]^{3 -}$ will show maximum $Δ_{o}$ (CFSE) value.

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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. In which of the following octahedral complexes of

C o

(Z = 27) will the magnitude of

Δ_{0}

be the highest?

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:

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

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The complex ion having minimum magnitude of △0 (CFSE) in octahedral field is:

The complex ion having minimum magnitude of $△_{0}$ (CFSE) in octahedral field is: