Which of the following statements is incorrect?

1. A
   Aluminium reacts with excess $\text{NaOH}$ to give ${\text{Al(OH)}}_3$.
2. B
   ${\text{NaHCO}}_3$ on heating gives ${\text{Na}}_2{\text{CO}}_3$.
3. C
   Pure sodium metal dissolves in liquid ammonia to give blue solution.
4. D
   $\text{NaOH}$ reacts with glass to give sodium silicate.