A) \[HBr\]
B) \[HCl\]
C) \[HI\]
D) HF
Correct Answer: D
Solution :
Glass being a mixture of sodium and calcium silicates, reacts with hydrofluoric acid forming sodium and calcium fluorosilicates respectively. \[N{{a}_{2}}Si{{O}_{3}}+8HF\xrightarrow{{}}2NaF+{{H}_{2}}Si{{F}_{6}}+3{{H}_{2}}O\] \[CaSi{{O}_{3}}+8HF\xrightarrow{{}}Ca{{F}_{2}}+{{H}_{2}}Si{{F}_{6}}+3{{H}_{2}}O\] This property is used in the etching of glass.
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