Answer:
The correct statement is C
NH4+ is the conjugate acid of NH3
Explanation:
NH₃ + H₂O ⇌ OH⁻ + NH₄⁺
Ammonia is the base
Water is the acid
So the conjugate pairs are.
the acid, amonium
the base, the hydroxide
Water is also known as an amphoterus compound. It can act as an acid, or as a base at the same time. (Bronsted-Lory)