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The gas evolved on heating

Question:

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. silica gel

  2. silicic acid

  3. hydrofluosilicic acid

  4. calciumfluorosilicate


Correct Option: , 2

Solution:

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