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Conjugate acid-base pair differ by
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The correct answer is:
proton
According to Bronsted-Lowry concept, after losing a proton, acids convert into conjugate base and after gaining a proton, bases convert into their conjugate acid, ie,
$$
\begin{array}{l}
\text { Acid }-\mathrm{H}^{+} \longrightarrow \text { conjugate base } \\
\text { Base }+\mathrm{H}^{+} \longrightarrow \text { conjugate acid }
\end{array}
$$
Thus, conjugate acid-base pair is differ by proton.
$$
\begin{array}{l}
\text { Acid }-\mathrm{H}^{+} \longrightarrow \text { conjugate base } \\
\text { Base }+\mathrm{H}^{+} \longrightarrow \text { conjugate acid }
\end{array}
$$
Thus, conjugate acid-base pair is differ by proton.
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