Select the correct statements for $[Fe(CN)_6]^{3-}$ complex:
(A) Paramagnetic
(B) $sp^3d^2$ hybridization
(C) Magnetic moment = 5.92 BM
(D) $d^2sp^3$ hybridization
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A) and (D) only
[Fe(CN)6]3-: Oxidation state of Fe:
$x + 6(-1) = -3 ⇒x = +3$
So, Fe³⁺ → d⁵ configuration
- Nature of ligand: CN⁻ is a strong field ligand → causes low-spin complex
- Hybridization: Low-spin octahedral → d²sp³
- Magnetic property: Low-spin d⁵ → 1 unpaired electron
- Magnetic moment ≈ 1.73 BM (not 5.92 BM; 5.92 BM corresponds to high-spin d⁵)
- Paramagnetic? Yes, because it has 1 unpaired electron
Correct statements:
- (A) Paramagnetic
- (D) d²sp³ hybridization
Answer: (A) and (D) only