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The gas evolved on heating CaF2 and SiO2 with concentrated H2SO4, on hydrolysis gives a white gelatinous precipitate. The precipitate is:
  • a)
    hydrofluosilicic acid
  • b)
    silica gel
  • c)
    silicic acid
  • d)
    calcium fluorosilicate
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The gas evolved on heating CaF2 and SiO2 with concentrated H2SO4, on h...
The chemical reactions of CaF2 , SiO2 and SiF4 in concentration of H2SO4 are,



The precipitate is hydrofluosilicic acid.
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The gas evolved on heating CaF2 and SiO2 with concentrated H2SO4, on h...
The chemical reactions of CaF2 , SiO2 and SiF4 in concentration of H2SO4 are,



The precipitate is hydrofluosilicic acid.
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Community Answer
The gas evolved on heating CaF2 and SiO2 with concentrated H2SO4, on h...
H2SO4 + CaF2 ---- CaSO4 +2 HF

4 HF + SiO2----- SiF4 + 2 H2O

3 SiF4 + 2 H2O ---- 2 H2SiF6 + SiO2

H2SiF6 is known as hydrofluosilicic acid...
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The gas evolved on heating CaF2 and SiO2 with concentrated H2SO4, on hydrolysis gives a white gelatinous precipitate. The precipitate is:a)hydrofluosilicic acidb)silica gelc)silicic acidd)calcium fluorosilicateCorrect answer is option 'A'. Can you explain this answer?
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