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Among the following cyanide complexes, which one would show the least paramagnetic character?

1. [Co(CN)6]3−
2. [Fe(CN)6]3−
3. [Mn(CN)6]3−
4. [Cr(CN)6]3−

Correct answer: [Co(CN)6]3−

Solution

[Co(CN)6]3− has a low-spin configuration due to the strong field strength of cyanide ligands, resulting in all electrons being paired and thus exhibiting the least paramagnetic character compared to the other complexes.

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