Using crystal field theory, identify from the following complex ions that shows same $\mu_{\mathrm{eff}}$ (spin only) values(A) $\left[\mathrm{CoF}_{6}\right]^{3-}$(B) $\left[\mathrm{IrCl}_{6}\right]^{3-}$(C) $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$
(a)A and B
(b)B and C
(c)A and C
(d)A, B and C
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
[CoF₆]³⁻: high-spin d⁶, 4 unpaired; [IrCl₆]²⁻: low-spin d⁵, 1 unpaired; [Fe(H₂O)₆]²⁺: high-spin d⁶, 4 unpaired. A and C share μ = 4.9 BM.