Which one of the following cyano complexes exhibit the lowest value of paramagnetic behaviour?

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[Co(CN)₆]^3–

[Cr(CN)₆]^3–

[Fe(CN)₆]^3–

[Mn(CN)₆]^3–

answer is D.

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Detailed Solution

The compound that has the lowest number of unpaired electrons-have the lowest value of paramagnetic behavior.

The oxidation state of Cr in [Cr(CN)₆]^3- is +3 and has three unpaired electrons in 3d-subshell, when cyanide ion approaches.
The oxidation state of Mn in [Mn(CN)₆]^3- is +3 and there is only one unpaired electron in 3d-subshell when cyanide approaches to it.
The oxidation state of Fe in [Fe(CN)₆]^3- is +3 and there is one unpaired electron in 3d-subshell, when cyanide ion approaches.
The oxidation state of Co in [Co(CN)₆]^3- is +3 and all electrons gets paired in 3d subshell when cyanide ion approaches. Therefore, the magnetic moment of the complex is zero and it is diamagnetic.

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