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What happens when silica is treated with...

What happens when silica is treated with HF ? Give equation.

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Silica on reaction with HF produces `SiF_4` first which further reacts with HF to form hydrofluorosilicic acid.
`SiO_2+4HFtoSiF_4+2H_2O , SiF_4+2HFtoH_2SiF_6`
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