A) oleum
B) \[HF\]
C) \[HN{{O}_{3}}\]
D) \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]
Correct Answer: B
Solution :
Common glass is a mixture of\[N{{a}_{2}}Si{{O}_{3}}\]and\[CaSi{{O}_{3}}\]. It reacts with hydrofluoric acid to give soluble products. \[N{{a}_{2}}Si{{O}_{3}}+8HF\xrightarrow{{}}2NaF+{{H}_{2}}Si{{F}_{6}}+3{{H}_{2}}O\] \[CaSi{{O}_{3}}+8HF\xrightarrow{{}}Ca{{F}_{2}}+{{H}_{2}}Si{{F}_{6}}+3{{H}_{2}}O\]
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