Chemistry - CHEMICAL BONDING Question with Solution | TestHub

The existence of species depends on factors like electronegativity, size, and oxidation states.

A. ClH₃: Chlorine typically forms one bond (HCl). ClH₃ is unstable due to chlorine's electron configuration.

B. SiI₆²⁻: Silicon can form SiF₆²⁻, but iodine is too large to accommodate six around silicon.

C. FeI₃: Fe³⁺ is a strong oxidizing agent, and I⁻ is a reducing agent. FeI₃ is unstable; FeI₂ is common.

D. AlF₆³⁻: Aluminum readily forms stable octahedral complexes with fluoride due to Al³⁺'s small size and high charge, and F⁻'s high electronegativity. This is a common and stable complex.

The final answer is $\boxed{D}$.