Question

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

(Atomic no. Cr = 24, Mn = 25, Fe = 26, Co = 27)

विकल्प

• [Co(CN)₆]³⁻

• [Fe(C₂O₄)3]³⁻

• [Mn(CN)₆]³⁻

• [Cr(CN)₆]³⁻

Answer 1

[Co(CN)₆]³⁻

Explanation:

The electronic structures of central metal ions in the complexes are shown below:

The complex [Co(CN)₆]³⁻ exhibits the least paramagnetic behaviour due to the absence of unpaired electrons. It’s actually diamagnetic in nature.