MCQ
The product obtained when silica reacts with hydrogen fluoride is
- A$SiF_4$
- ✓$H_2SiF_6$
- C$H_2SiF_4$
- D$H_2SiF_3$
✓
Answer
Correct option: B.
$H_2SiF_6$
b
The final product formed when silica $\left(\mathrm{SiO}_{2}\right)$ reacts with hydrogen fluoride $(\mathrm{HF})$ is $\mathrm{H}_{2} \mathrm{SiF}_{6} .$
The final product formed when silica $\left(\mathrm{SiO}_{2}\right)$ reacts with hydrogen fluoride $(\mathrm{HF})$ is $\mathrm{H}_{2} \mathrm{SiF}_{6} .$
The reactions are as follows:
$\mathrm{SiO}_{2}+4 \mathrm{HF} \rightarrow \mathrm{SiF}_{4}+2 \mathrm{H}_{2} \mathrm{O}$
$3 \mathrm{SiF}_{4}+4 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{H}_{2} \mathrm{SiF}_{6}+\mathrm{H}_{4} \mathrm{SiO}_{4}$
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