The gas evolved on heating CaF_2 and SiO_2 wi | vedclass

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(C) The reaction of $CaF_2$ and $SiO_2$ with concentrated $H_2SO_4$ produces silicon tetrafluoride gas $(SiF_4)$:$2CaF_2 + SiO_2 + 2H_2SO_4 \longright

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silicic acid

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(C) The reaction of $CaF_2$ and $SiO_2$ with concentrated $H_2SO_4$ produces silicon tetrafluoride gas $(SiF_4)$:$2CaF_2 + SiO_2 + 2H_2SO_4 \longrightarrow SiF_4 + 2CaSO_4 + 2H_2O$When $SiF_4$ is hydrolyzed,it forms hydrofluosilicic acid and a white gelatinous precipitate of silicic acid $(H_2SiO_3)$:$3SiF_4 + 3H_2O \longrightarrow 2H_2SiF_6 + H_2SiO_3$ (white gelatinous precipitate of silicic acid).

The gas evolved on heating $CaF_2$ and $SiO_2$ with concentrated $H_2SO_4$,on hydrolysis gives a white gelatinous precipitate. The precipitate is

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