Q. Among the species given below, the spin-only magnetic moment is highest for (Given: Atomic number of Ti = 22, Mn = 25, Fe = 26 and Co = 27)
A) [Ti(H₂O)₆]³⁺
B) [Mn(CN)₆]³⁻
C) [Fe(CN)₆]³⁻
D) [Co(NH₃)₆]³⁺
Explanation
[Solution from source] Ti³⁺ (d¹) has 1 unpaired electron. With strong-field CN⁻, Mn³⁺ (d⁴) is t₂g⁴ with 2 unpaired electrons (μ ≈ 2.83 BM) and Fe³⁺ (d⁵) is t₂g⁵ with 1. Co³⁺ (d⁶) with NH₃ is low-spin with none. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.