In which of the following is silica (SiO_2) s | vedclass

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(D) Silica $(SiO_2)$ is an acidic oxide and is generally inert to most acids. However,it reacts with hydrofluoric acid $(HF)$ to form silicon tetraflu

Vedclass · Accepted Answer

$HF$

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(D) Silica $(SiO_2)$ is an acidic oxide and is generally inert to most acids. However,it reacts with hydrofluoric acid $(HF)$ to form silicon tetrafluoride $(SiF_4)$ and water. The reaction is: $SiO_2 + 4HF \rightarrow SiF_4 + 2H_2O$. Further,$SiF_4$ can react with excess $HF$ to form hexafluorosilicic acid $(H_2SiF_6)$: $SiF_4 + 2HF \rightarrow H_2SiF_6$. Thus,silica is soluble in $HF$.

In which of the following is silica $(SiO_2)$ soluble?

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