Answer
See the answer below.
Work Step by Step
a) Products: $H_3O^++ClO_4^-$
Acid/Conj. base: $HClO_4/ClO_4^-$, Base/Conj. acid: $H_2O/H_3O^+$
b) Products: $H_3O^++NH_3$
Acid/Conj. base: $NH_4^+/NH_3$, Base/Conj. acid: $H_2O/H_3O^+$
c) Products: $CO_3^{2-}+H_2O$
Acid/Conj. base: $HCO_3^-/CO_3^{2-}$, Base/Conj. acid: $OH^-/H_2O$