Question

$Si{O}_2$ can react with:

• A. $NaOH$ only
• B. $HF$ only
• C. Neither $HF$ nor $NaOH$
• D. Both $HF$ and $NaOH$

Answer 1

The correct option is D Both $HF$ and $NaOH$

Silicon dioxide reacts with sodium hydroxide to producte sodium silicate and water. This reaction takes place at temperature of $900-{1000}^{\circ }C$
$2NaOH+Si{O}_2\to N{a}_{2}Si{O}_3+H_{2}O$
Silicon dioxide reacts with hydrofluoric acid to produce hexafluro silicic acid & water.
$Si{O}_2+6HF\to H_{2}Si{F}_6+2H_{2}O$
$Si{O}_2$ definitely reacts with strong bases like $NaOH$
$Si{O}_2$ is a very stable and unreactive toward various acids and chlorides, however it react with $HF$ to give $H_{2}Si{F}_6.$