Question

Which of the following acid is formed when $SiF_4$ reacts with water?

• A. $SiF_4$
• B. $H_2SiF_4$
• C. $H_2SO_4$
• D. $H_2SiF_6$

Answer 1

Answer: (B)

Silicon tetra fluoride on hydrolysis furnish ortho silicic acid and hydrogen silicofluoride.
$\underset{\overset{\text{(Silicon tetra}}{\text{Fluoride}}}{3SiF_4} + \underset{\text{Water}}{4H_2O} \rightarrow \underset{\overset{\text{(Ortho}}{\text{Silicic acid)}}}{H_2SiO_4} + \underset{\overset{\text{(Hydrogen Silico}}{\text{Fluoride)}}}{2H_2SiF_4}$