P-Block Elements Ques 82
Question: Which of the following attacks glass
[NCERT 1976; AFMC 2005]
Options:
A) HCl
B) HF
C) HI
D) HBr
Show Answer
Answer:
Correct Answer: B
Solution:
Glass being a mixture of sodium and calcium silicates reacts with hydrofluoric acid forming sodium and calcium fluorosilicates respectively. $ Na_2SiO_3+3H_2F_2\to Na_2SiF_4+3H_2O $ $ CaSiO_3+3H_2F_2\to CaSiF_4+3H_2O $ The etching of glass is based on these reactions.
