A) neither an acid nor base
B) both an acid and a base
C) a conjugate acid
D) a conjugate base
Correct Answer: C
Solution :
Ammonium ion is a conjugate acid. Water behaves both as an acid as well as a base. It is amphoteric solvent. In reaction like \[{{H}_{2}}O+N{{H}_{3}}\rightleftharpoons \underset{conjugate\,acid}{\mathop{NH_{4}^{+}}}\,+O{{H}^{-}}\] it behaves like an acid.
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