Ammonia is a weak base because ammonia doesn't contain hydroxide ions ([tex]OH^-[/tex]). Ammonia dissolves partially in water to give hydroxide ions, therefore it is a weak base. Hence, option C is correct.
Weak bases are the basic substances that do not completely ionize in water. An example of a weak base is ammonia.
When [tex]NH_3[/tex] is dissolved in water, a part of it dissociates into ammonium cation and hydroxide anions by interacting with the water molecules.
Hence, option C is correct.
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