Which of the following statements is incorrect?

1.	NaHCO3 on heating gives Na2CO3.
2.	Pure sodium metal dissolves in liquid ammonia to give a blue solution.
3.	NaOH reacts with glass to give sodium silicate.
4.	Aluminium reacts with excess NaOH to give Al(OH)3.

Which of the following oxide is amphoteric?

1. CO₂ 

2. SnO₂

3. CaO 

4. SiO₂

Al₂O₃ can be converted to anhydrous AlCl₃ by heating:

1. $A{l}_2{O}_3$ $with$ $HCl$ $gas$

2. $A{l}_2{O}_3$ $$with NaCl in solid-state

3. a mixture of $A{l}_2{O}_3$ $$ and carbon in dry $C{l}_2$ gas

4. $A{l}_2{O}_3$ $$ with $C{l}_2$ gas

Which one of the following anions is present in the chain structure silicates?

1. $S{i}_2{O}_7^{6-}$

2. $\left(S{i}_2{O}_5^{2-}\right)n$

3. $\left(Si{O}_3^{2-}\right)n$

4. $Si{O}_4^{4-}$

A compound among the following that is least likely to behave as a Lewis base is:

The basic structural unit of silicates is:

1. SiO₄^4–

2. SiO₃^2–

3. SiO₄^2–

4. SiO

Which of these is not a monomer for a high molecular mass silicone polymer?

A compound among the following having a similar structure to graphite is:

1. B
2. B₄C
3. B₂H₆
4. BN