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Q.

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

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a

calciumfluorosilicate

b

hydrofluosilicic acid 

c

silica gel

d

silicic acid

answer is A.

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Detailed Solution

Reactions. 

H2SO4+CaF2CaHSO42+H2F22H2F2+SiO2SiF4+2H2OSiF4+H2OH2SiF6

H2SiF6 is hydrofluorosilicic acid.

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