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Brønsted–Lowry Acid Bases Reaction

APCHEM-XUXNMO

Which of the following identifies the conjugate acid-base pairs in the following reaction?

$$HCl_{(aq)} + NH_{3 (aq)} \rightleftharpoons Cl^-_{(aq)} + NH^+_{4 (aq)}$$

A

$HCl / NH_3$ and $Cl^- / NH^+_4$

B

$HCl / Cl^-$ and $NH_3 / NH^+_4$

C

$HCl / NH^+_4$ and $NH_3 / Cl^-$

D

$HCl / NH_3$ only