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Question

The gas evolved on heating CaF2 and SiO2 with concentrated H2SO4, on hydrolysis gives a white gelatinous precipitate. The precipitate is:

A
hydrofluorosilicic acid
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B
silica gel
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C
silicic acid
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D
calciumfluorosilicate
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Solution

The correct option is A hydrofluorosilicic acid
Reactions:
H2SO4+CaF2Ca(HSO4)2+H2F2

2H2F2+SiO2SiF4+2H2O

SiF4+H2OH2[SiF6]

H2SiF6 is hydrofluorosilicic acid.

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