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Q.

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

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a

Hydrofluorosilicic acid

b

Calciumfluorosilicate

c

Silica gel

d

Silicic acid

answer is D.

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Detailed Solution

2CaF2+SiO2+H2SO4⟶SiF4+H2O+CaSO4⟶ hydrolysis CaSiF6

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