A) \[{{\operatorname{HIO}}_{4}}\]
B) \[{{\operatorname{SiF}}_{4}}\]
C) HF
D) \[{{\operatorname{HNO}}_{3}}\]
Correct Answer: C
Solution :
HF Although, weak, HF is the most reactive of all halogen acids. It can attack glass because of its ability to displace oxygen from silicate ion to form fluorosilicate ion. \[{{\operatorname{Na}}_{2}}Si{{O}_{3}} +6HF\to N{{a}_{2}}Si{{F}_{6}}+3{{H}_{2}}O\] (glass) Thats why HF is used for etching of glass, in making thermometers, burettes etc.
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