Question

Which of the following acid is formed when $SiF_{4}$ reacts with water.

• A. $SiF_{4}$
• B. $H_{2}SiF_{4}$
• C. $H_{2}SO_{4}$
• D. $H_{2}SiF_{6}$

Answer 1

Answer: (B)

$H_{2}SiF_{4}$

Answer 2

Silicon tetra fluoride on hydrolysis furnish ortho silicic acid and hydrogen silicofluoride.

& (\text{Silicon tetra} \\ & \text{Fluoride}) \end{aligned}}{3SiF_{4}} + \underset{(\text{Water})}{4H_{2}O}\overset{\quad\quad}{\rightarrow}\underset{\begin{aligned} & (\text{Ortho} \\ & \text{Silicic acid}) \end{aligned}}{H_{2}SiO_{4}} + \underset{\begin{aligned} & (\text{Hydrogen Silico} \\ & \text{Fluoride}) \end{aligned}}{2H_{2}SiF_{4}}$$