A) \[HONO,\,NO_{2}^{-}\]
B) \[C{{H}_{3}}NH_{3}^{+},C{{H}_{3}}N{{H}_{2}}\]
C) \[{{C}_{6}}{{H}_{5}}COOH,{{C}_{6}}{{H}_{5}}CO{{O}^{-}}\]
D) \[{{H}_{3}}{{O}^{+}},O{{H}^{-}}\]
Correct Answer: D
Solution :
\[{{H}_{3}}{{O}^{+}};\,O{{H}^{-}}\] is not a conjugate acid-base pair. The correct acid-base pair is| Acid | Base |
| \[{{H}_{3}}{{O}^{+}}\] | \[{{H}_{2}}O\] |
| \[{{H}_{2}}O\] | \[O{{H}^{-}}\] |
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