NEVER I REPEAT NEVER MIX BLEACH WITH AMMONIA

The bleach decomposes to form hydrochloric acid, which reacts with ammonia to form toxic chloramine fumes.

First the hydrochloric acid is formed:
NaOCl → NaOH + HOCl
HOCl → HCl + O

Then the ammonia and chlorine gas react to form chloramine, which is released as a vapor:
NaOCl + 2HCl → Cl2 + NaCl + H2O
2NH3 + Cl2 → 2NH2Cl

If ammonia is present in excess, toxic and potentially explosive liquid hydrazine may be formed. While impure hydrazine tends not to explode, it's still toxic, plus it can boil and spray hot toxic liquid.
2NH3 + NaOCl → N2H4 + NaCl + H2O


SO DON'T BE A FOOL, STAY IN SCHOOL