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Explain the following reactions : Silicon dioxide is treated with hydrogen fluoride. |
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Answer» Solution : When SILICON dioxide `(SiO_2)` is heated with hydrogen fluoride (HF), it forms silicon tetrafluoride `(SiF_4)`. Usually, the Si- O bond is a STRONG bond and it resists any attack by halogens and most acids, EVEN at a HIGH temperature. However, it is attacked by HF. `SiO_2 + 4HF to SiF_4 + 2H_2O` The `SiF_4` formed in this reaction can further react with HF to form hydrofluorosilicic acid. `SiF_4 + 2HF toH_2SiF_6` |
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