A when added to silica gives B A and B are HF H2SiF4 HF
![A when added to silica gives B A and B are HF H2SiF4 HF](/img/relate-questions.png)
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A when added to silica gives B. A and B are:
A.
HF, H2SiF4
B.
HF, H2SiF6
C.
HCl, H2SiCl6
D.
HI, H2SiI6
Please scroll down to see the correct answer and solution guide.
Right Answer is: A
SOLUTION
H2CO3(aq)+H2O(l)⇌HCO⊖3(aq)+H3O⊖(aq)
HCO⊖3(aq)+H2O(l)⇌CO2−3(aq)+H3O⊖(aq)
Silica is readily attacked by HF, resulting in the formation of SiF4.
SiO2+4HF→SiF4+2H2O
SiF4 thus formed dissolves in HF, forming hydroflurosilicic acid.
SiF4+2HF→H2SiF6
Due to the formation of H2SiF6,SiO2 present in glass dissolves. Therefore, HF cannot be stored in glass bottles.
4HF+SiO2→H2SiF4+H2O
↓ ↓
A B