Question

The diamagnetic species is ______.

[At. No.: Co = 27, Fe = 26, Ni = 28]

Options

• [Ni(CN)₄]^2–

• [NiCl₄]^2–

• [Fe(CN)₆]^3–

• [CoF₆]^3–

Answer 1

The diamagnetic species is \[\ce{\mathbf{\underline{[Ni(CN)_4]^{2– }}}}\].

Explanation:

It is diamagnetic because it does not have any unpaired electrons due to the presence of the cyanide ion (CN⁻), which is a strong-field ligand, causing all the d electrons to pair up.