A) \[NO_{3}^{-}\]
B) \[C{{l}^{-}}\]
C) \[SO_{4}^{2-}\]
D) \[C{{H}_{3}}CO{{O}^{-}}\]
Correct Answer: D
Solution :
Weak acid forms strong conjugate base. \[\ln \,HN{{O}_{3}},\,HCl,\,{{H}_{2}}S{{O}_{4}}\] and \[C{{H}_{3}}COOH,\,\,C{{H}_{3}}COOH\] is weak acid so its conjugate base is strongest. \[C{{H}_{3}}COOH\rightleftharpoons \,\underset{(conjugate\,base)}{\mathop{C{{H}_{3}}CO{{O}^{-}}+{{H}^{+}}}}\,\]
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