Which of the following statements is incorrect?

• A
  Pure $Na$ metal dissolves in liquid ammonia to give a blue-colored solution.
• B
  The reaction of $NaOH$ with glass yields sodium silicate.
• C
  Aluminum metal reacts with excess $NaOH$ to form $Al(OH)_3$.
• D
  Heating $NaHCO_3$ yields $Na_2CO_3$.