Question

When HF reacts with glass, the compound formed is:

• A. $F_2$
• B. $NaF$
• C. $N{a}_{3}Al{F}_3$
• D. $N{a}_{2}Si{F}_6$

Answer 1

Answer: (D)

$N{a}_{2}Si{F}_6$

When glass is attacked by $HF$, it forms $N{a}_{2}Si{F}_6$ and this property is used for the etching of glass.

The reaction is given below:
$N{a}_{2}Si{O}_3+6HF\to N{a}_{2}Si{F}_6+3H_{2}O$

Option D is correct.