Which of the following complex represent maximum stability?

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

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

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[C o (C N)_{6}]^{4 -}

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[C o (C_{2} O_{4})_{3}]^{3 -}

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Solution

The correct option is C $[C o (C N)_{6}]^{3 -}$
The complex having the maximum stability will be the one having maximum CFSE. In the complex $[C o (C N)_{6}]^{3 -}$ the Co is +3 oxidized and the ligand present is a strong field ligand hence the configuration of the Co will be $t_{2} g^{6} e g^{0}$ and therefore the CFSE will be -0.4 $Δ_{o}$ x 6 = -2.4 $Δ_{o}$ which is maximum among all the options. Hence option A is the correct answer.

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Similar questions

Q. In which of the following octahedral complexes of

C o

(Z = 27) will the magnitude of

Δ_{0}

be the highest?

Q. In

[C o (C N)_{6}]^{4 -}

and

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

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

Which of these statements about $[C o (C N)_{6}]^{3 -}$ is true?

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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