Single Choice

Which of theses statements about $$[Co(CN)_6]^{3-}$$ is true?

A$$[Co(CN)_6]^{3-}$$ has four unpaired electrons and will be in a high-spin configuration.
B$$[Co(CN)_6]^{3-}$$ has no unpaired electrons and will be in a high-spin configuration.
C$$[Co(CN)_6]^{3-}$$ has no unpaired electrons and will be in a low-spin configuration.
Correct Answer
D$$[Co(CN)_6]^{3-}$$ has four unpaired electrons and will be in a low-spin configuration.

Solution

The electronic configuration of Co is $$[Ar]3d^74s^2$$. The central Co atom has +3 oxidation state and $$3d^6$$ as outer electronic configuration. Cyanide ion is a strong field ligand and $$\Delta _o > P$$. Hence, pairing of electrons is preferred. Hence, the outer electronic configuration of $$Co^{3+}$$ can be written as $$t_{2g}^6e_g^0$$ Thus, $$[Co(CN)_6]^{3-}$$ has no unpaired electrons and will be in a low-spin configuration.

SIMILAR QUESTIONS

Coordination Compounds

Which of the following is paramagnetic?

Coordination Compounds

$$2.76 g$$ of silver carbonate on being strongly heated yields a residue weighing:

Coordination Compounds

$$[Fe(CN)_6]^{-3}$$ is low spin complex but $$[Fe(H_2O)_6]^{+3}$$ is high spin complex. Explain.

Coordination Compounds

The correct statement about the magnetic properties of $$[Fe(CN)_6]^{3-}$$ and $$[FeF_6]^{3-}$$ is $$(Z=26)$$:

Coordination Compounds

Three complexes, $$[CoCl(NH_3)_5]^{2+} (I)$$, $$[Co(NH_3)_5H_2O]^{3+} (II)$$ and $$[Co(NH_3)_6]^{3+}(III)$$ absorb light in the visible region. The correct order of the wavelength of light absorbed by them is:

Coordination Compounds

Which of the following facts about the complex $$[{C}{r}({N}{H}_3)_{6}]{C}l_{3}$$ is wrong?

Coordination Compounds

Which of the following will form an octahedral complex?

Coordination Compounds

For the octahedral complexes of $$\displaystyle Fe^{3+}$$ in $$\displaystyle SCN^{-}$$ (thiocyanato-$$S$$) and in $$\displaystyle CN^{-}$$ ligand environments, the difference between the spin-only magnetic moments in Bohr magnetons (when approximated to the nearest integer) is: [Atomic number of Fe = 26]

Coordination Compounds

The correct statement(s) regarding the binary transition metal carbonyl compounds is/are: (Atomic numbers: $$Fe=26$$, $$Ni=28$$).

Coordination Compounds

Low spin tetrahedral complexes are not formed because:

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