P-Block Elements Ques 519

Question: 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:

Options:

A) hydrofluosilicic acid

B) silica gel

C) silicic acid

D) calciumfluorosilicate

Show Answer

Answer:

Correct Answer: D

Solution:

$ 2CaF_2+SiO_2+H_2SO_4\xrightarrow{{}} $ $ SiF_4+H_2O+CaSO_4\xrightarrow{hydrolysis}CaSiF_4 $



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