Identify, from the following, the diamagnetic, tetrahedral complex

Step-by-step solution

(a) Ni in [ Ni ( Cl )₄ ]²⁻ exist as Ni ²⁺ ion. Cl is a weak field ligand (high spin). It will not cause pairing of electrons. Hence, configuration of [ Ni ( Cl )₄ ]²⁻ is Tetrahedral with two unpaired electrons (i.e., paramagnetic) and has s p^3 hybridisation. (b) In [ Co ( C ₂ O ₄ )₃ ]³⁻, ( C ₂ O ₄ )₃²⁻ is a bidentate ligand thus, give octahedral structure. (c) In [ Ni ( CN )₄ ]²⁻ , Ni exist as Ni ²⁺ ion. CN ⁻ is a strong field ligand (low spin). Causes pairing of electrons of 3 d orbital. Hence, the structure of i