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:
silica gel
silicic acid
hydrofluosilicic acid
calciumfluorosilicate
Correct Option: , 2
Solution:
