The conjugate acid is formed when the base gains an [tex]H^+[/tex]. Hence, option D is correct.
What are conjugate acid and base?
An acid and a base which differ only by the presence or absence of a proton are called a conjugate acid-base pair.
In the Brønsted–Lowry definition of acids and bases, a conjugate acid-base pair consists of two substances that differ only by the presence of a proton (H⁺).
A conjugate acid is formed when a proton is added to a base, and a conjugate base is formed when a proton is removed from an acid.
Hence, option D is correct.
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