Question

The final product formed when silica reacts with hydrogen fluoride is :

• A. $SiF$
• B. $H_{2}Si{F}_6$
• C. $H_{2}Si{F}_4$
• D. $H_{2}Si{O}_3$

Answer 1

The correct option is B $H_{2}Si{F}_6$

The final product formed when silica $\left(Si{O}_2\right)$ reacts with hydrogen fluoride $\left(HF\right)$ is $H_{2}Si{F}_6$. The reactions are as follows:

$Si{O}_2+4HF\to Si{F}_4+2H_{2}O$

$3Si{F}_4+4H_{2}O\to 2H_{2}Si{F}_6+H_{4}Si{O}_4$