An ammonium salt was mixed with excess hot aqueous sodium hydroxide, and ammonia gas was released. After ammonia was no longer being produced, aluminium was introduced into the solution left behind, and further ammonia gas was evolved. Which ammonium salt was it?
- A$\text{NH}_4\text{Cl}$
- B$\text{NH}_4\text{NO}_3$
- C$(\text{NH}_4)_2\text{CO}_3$
- D$(\text{NH}_4)_2\text{SO}_4$