Question

Which of the following is paramagnetic?

Options

• [Ni(CO)₄]²⁺

• [Co(NH₃)₆]³⁺

• [Ni(CH)₄]^2–

• [NiCl₄]^2–

Answer 1

[NiCl₄]^2– 

Explanation:

[NiCl₄]^2– is the correct answer. The Cl^–1 ion is a weak field ligand in the case of [NiCl₄]^2–. As a result, it does not result in the pairing of unpaired 3d electrons.