Chemistry - CHEMICAL BONDING Question with Solution | TestHub

Question Explanation:

Identifies which compound undergoes complete rather than partial hydrolysis.

Concept:

Complete vs. Partial Hydrolysis of Halides.

Solution:

Partial hydrolysis occurs when the initial product reacts with byproduct (like HF) to form a stable complex ion. ${\mathrm{SiCl}}_4$ undergoes complete hydrolysis because HCl is a weak complexing agent and escapes as gas, leaving only silicic acid. In contrast, ${\mathrm{SiF}}_4$ and ${\mathrm{BF}}_3$ form ${\left[{\mathrm{SiF}}_6\right]}^{2-}$ and ${\left[{\mathrm{BF}}_4\right]}^{-}$ respectively, leading to incomplete/partial reaction.

${\mathrm{SiCl}}_4+4{\mathrm{H}}_2\mathrm{O}\to \mathrm{Si}(\mathrm{OH}{)}_4+4\mathrm{HCl}\uparrow ($ Complete $)$

$3{\mathrm{SiF}}_4+4{\mathrm{H}}_2\mathrm{O}\to \mathrm{Si}(\mathrm{OH}{)}_4+2{\mathrm{H}}_2\left[{\mathrm{SiF}}_6\right]$ (Partial)

Final Answer : ${\mathbf{SiCl}}_4$