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11.21.    Explain the following reactions

 (b) Silicon dioxide is treated with hydrogen fluoride;

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When Silicon dioxide is treated with hydrogen fluoride, it forms silicon tetrafluoride

SiO_{2}+4HF\rightarrow SiF_4+2H_{2}O

and SiF_4 further reacts with the HF to form hydrofluorosilic acid.

SiF_4+2HF\rightarrow H_{2}SiF_{6}???????

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manish

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