Question

Which of the following acid is formed when $Si{F}_4$ reacts with water?

• A. $Si{F}_4$
• B. $H_{2}Si{F}_4$
• C. $H_{2}S{O}_4$
• D. $H_{2}Si{F}_6$

Answer 1

Answer: (B)

Silicon tetra fluoride on hydrolysis furnish ortho silicic acid and hydrogen silicofluoride.
$\underset{\stackrel{\text{(Silicon tetra}}{\mathrm{Fluoride}}}{3Si{F}_4}+\underset{\text{Water}}{4H_{2}O}\to \underset{\stackrel{\text{(Ortho}}{\text{Silicic acid)}}}{H_{2}Si{O}_4}+\underset{\stackrel{\text{(Hydrogen Silico}}{\text{Fluoride)}}}{2H_{2}Si{F}_4}$