Question

The crystal field stabilization energy (CFSE) of [Fe(H₂O)₆]Cl₂ and K₂[NiCl₄] respectively, are : 

(1) – 0.4Δ_o and – 0.8Δ_t 

(2) – 0.6Δ_o and – 0.8Δ_t 

(3) – 2.4Δ_o and – 1.2Δ_t 

(4) – 0.4Δ_o and – 1.2Δ_t

Answer 1

Correct option (1) – 0.4Δ_o and – 0.8Δ_t 

Explanation:

H₂O is a weak field ligand so pairing do not take place  

Cl^– → weak field ligand, Δ₀ paring do not takes place and have tetrahedral geometry