Among the following pairs of complexes, in which case the $△_{0}$ value is higher for the first one?

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

and

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

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

and

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

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

and

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

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[R h (H_{2} O)_{6}]^{3 +}

and

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

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Solution

The correct option is B $[R h (H_{2} O)_{6}]^{3 +}$ and $[C o (H_{2} O)_{6}]^{3 +}$
For the complexes $[R h (H_{2} O)_{6}]^{3 +}$ and $[C o (H_{2} O)_{6}]^{3 +}$ , the oxidation states of the central metal ions is same.
The ligands are also same. But the effective nuclear charge of the metal ions is different.
The $Z_{e f f}$ value of the $[R h (H_{2} O)_{6}]^{3 +}$ complex is higher than that of $[C o (H_{2} O)_{6}]^{3 +}$
Hence, $[R h (H_{2} O)_{6}]^{3 +}$ has higher value of $Δ_{o}$ than $[C o (H_{2} O)_{6}]^{3 +}$ .

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Similar questions

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:

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. In which of the following octahedral complexes of

C o

(Z = 27) will the magnitude of

Δ_{0}

be the highest?

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Among the following pairs of complexes, in which case the △0 value is higher for the first one?

Among the following pairs of complexes, in which case the $△_{0}$ value is higher for the first one?