The gas evolved on heating $\mathrm{CaF}_{2}$ and $\mathrm{SiO}_{2}$ with concentrated $\mathrm{H}_{2}…

The gas evolved on heating $\mathrm{CaF}_{2}$ and $\mathrm{SiO}_{2}$ with concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$, on hydrolysis gives a white gelatinous precipitate. The precipitate is:
  1. hydrofluosilicic acid
  2. silica gel
  3. silicic acid
  4. calciumfluorosilicate

Asked in: JEE-TOPICTESTS-CHEMISTRY

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