J.R. S. answered 01/09/21
Ph.D. University Professor with 10+ years Tutoring Experience
Ammonium hydroxide = NH4OH
In this molecule, you have N bonded to 4 H atoms and then you also have O bonded to H.
The 4 N-H bonds are covalent. The O-H bond is also covalent. The NH4 will have a +1 charge. The OH will have a -1 charge. These equal but opposite charges will attract one another forming an ionic bond.
So, ammonium hydroxide has both covalent and ionic bonds.