A) \[Si{{F}_{4}}\]
B) \[Si{{F}_{2}}\]
C) \[{{H}_{4}}Si{{O}_{4}}\]
D) none of these
Correct Answer: C
Solution :
Sand, on heating with HF, give silicon terafluoride vapours, which form silicic acid \[\text{(}{{\text{H}}_{4}}\text{Si}{{\text{O}}_{4}}\text{),}\] on coming in contact with water. \[Si{{O}_{2}}+4HF\xrightarrow{{}}Si{{F}_{4}}+2{{H}_{2}}O\] \[3\,Si{{F}_{4}}+4{{H}_{2}}O\xrightarrow{{}}2{{H}_{2}}Si{{F}_{6}}+\underset{\text{while}}{\mathop{{{H}_{4}}Si{{O}_{4}}}}\,\]
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