MCQ
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
- Ahydrofluosilicic acid
- Bsilica gel
- Csilicic acid
- ✓calciumfluorosilicate
✓
Answer
Correct option: D.
calciumfluorosilicate
d
$2CaF_2 + SiO_2 + H_2SO_4\, \longrightarrow$
$2CaF_2 + SiO_2 + H_2SO_4\, \longrightarrow$
$Si{F_4} + {H_2}O + CaS{O_4}\xrightarrow{{hydrolysis}}CaSi{F_6}$
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