Question

SiCl₄ on hydrolysis forms 'X' and HCl. Compound 'X' loses water at 1000^oC and gives 'Y'. Compounds 'X' and 'Y' respectively are

• A. H₂SiCl₆, SiO₂
• B. H₄SiO₄, Si
• C. SiO₂, Si
• D. H₄SiO₄, SiO₂

Answer 1

Answer: (D)

${\text{SiCl}}_4$ undergoes hydrolysis to form ortho silicic acid and hydrogen chloride, this hydrolysis reaction occurs due to the availability of vacant d orbitals in silicon atom.
${\left(\text{SiCl}\right)}_4+4{\left(\text{H}\right)}_{\text{2}}\text{O}\to \underset{(\text{X})}{{\left(\text{H}\right)}_{\text{4}}{\left(\text{SiO}\right)}_{\text{4}}}+\text{4HCl}$
${\left(\text{H}\right)}_{\text{4}}{\left(\text{SiO}\right)}_4{\to }_{{\left(\text{1000}\right)}^{\text{o}}\text{C}}^{\text{Δ}}\underset{(\text{Y})}{{\left(\text{SiO}\right)}_{\text{2}}}+2{\left(\text{H}\right)}_{\text{2}}\text{O}$