Question

Which of the following oxides is/are expected to react with sodium hydroxide?

• A. $CaO$
• B. $Si{O}_2$
• C. $BeO$
• D. $B_2{O}_3$

Answer 1

Answer: (B), (C), (D)

The correct options are
B $Si{O}_2$
C $BeO$
D $B_2{O}_3$

(A) $CaO$ does not react with $NaOH$ as it is basic in nature.

(B) Silica reacts with $NaOH$ to form sodium silicate known as glass.

$Si{O}_2+2NaOH\to \underset{\text{sodium silicate (glass)}}{N{a}_{2}Si{O}_3}+H_{2}O$

(C) Beryllium oxide reacts with NaOH to form sodium beryllate.

$BeO+2NaOH\to \underset{\text{sodium beryllate}}{N{a}_{2}Be{O}_2}+H_{2}O$

(D) Boron trioxide reacts with NaOH to form sodium borate.

$B_2{O}_3+6NaOH\to \underset{\text{sodium borate}}{2N{a}_{3}B{O}_3}+3H_{2}O$