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 $
