Properties and Uses of Calcium Oxide

Q.

Which of the following oxides is not expected to react with sodium hydroxide?

1. $CaO$

2. $Si{O}_2$

3. $BeO$

4. $B_2{O}_3$

Q. On heating $NaN{O}_3$, it gives:

1. $NaN{O}_2+O_2$
2. $N_2$
3. $N{O}_2$
4. $O_2+N{O}_2$