Answer: [tex]HI[/tex] and [tex]I^-[/tex]
Explanation:
According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.
For the given chemical equation:
[tex]HI+H_2O\rightarrow H_3O^++I^-[/tex]
Here, [tex]HI[/tex] is loosing a proton, thus it is considered as an acid and after losing a proton, it forms [tex]I^-[/tex] which is a conjugate base.
And, [tex]H_2O[/tex] is gaining a proton, thus it is considered as a base and after gaining a proton, it forms [tex]H_3O^+[/tex] which is a conjugate acid.
Hence, the correct answer is D.
