Consider the following statements for $\left[\mathrm{FeO}_{4}\right]^{4-}$A. It is paramagneticB. It has $\mathrm{T}_{d}$ symmetryC. Adopts distorted square planar geometryD. Shows approximately $\mathrm{D}_{2d}$ symmetryThe correct answer is
(a)A, B and C
(b)A, C and D
(c)A and D
(d)A and B
Answer
Answer: C ✓ checked by 4AB · confidence medium
Explanation
[FeO₄]⁴⁻ (as in Na₄FeO₄) is Fe(IV) d⁴, so paramagnetic. The FeO₄ tetrahedron is flattened, giving approximately D₂d symmetry. A and D (c).