Question

Which of the following will be soluble in $NaOH$?

• A. $Si{O}_2$
• B. $B_2{O}_3$
• C. $Si$
• D. All of the above

Answer 1

Answer: (D)

All of the above

$Si,Si{O}_3,B_2{O}_3$ all are soluble in $NaOH$. $Si$ or $Si{O}_2$ react with $NaOH$ and form $N{a}_{2}S{i}_3{O}_7$.

$2NaOH$ + $Si{O}_2$ $N{a}_{2}Si{O}_3$ + $H_{2}O$

Boron trioxide react with sodium hydroxide to produce sodium metaborate $NaB{O}_2$and water. This reaction takes place at a temperature of 400-550°C. it is a double decomposition reaction.

$B_2{O}_3$ + $2NaOH$ $2NaB{O}_2$ + $H_{2}O$