Q. Identify the homoleptic complex(es) that is/are low spin. (A) [Fe(CN)₅NO]²⁻ (B) [CoF₆]³⁻ (C) [Fe(CN)₆]⁴⁻ (D) [Co(NH₃)₆]³⁺ (E) [Cr(H₂O)₆]²⁺ Choose the correct answer from the options given below :
A) (C) only
B) (C) and (D) only
C) (A) and (C) only
D) (B) and (E) only
Explanation
[Solution by Dr. Abubacker] (A) is heteroleptic (CN⁻ and NO⁺). (B) [CoF₆]³⁻ is high spin (weak-field F⁻). (E) [Cr(H₂O)₆]²⁺ is high spin ($d^4$ with weak-field H₂O). (C) [Fe(CN)₆]⁴⁻ ($d^6$, CN⁻) and (D) [Co(NH₃)₆]³⁺ ($d^6$, NH₃) are homoleptic and low spin. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.