Question

Glass react with $HF$ to produce :

• A. $Si{F}_4$
• B. $H_{2}Si{F}_6$
• C. $H_{2}Si{O}_3$
• D. $N{a}_{3}Al{F}_6$

Answer 1

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

Common glass consists of silica ($Si{O}_2$). When $HF$ reacts with silica it will form $H_{2}Si{F}_6$ or $Si{F}_4$. Both can soluble in water which means that a fresh surface of $Si{O}_2$ will be exposed to attack by $HF$.

Hence option B is correct.