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.



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