The strongest conjugate base is :

N O_{3}^{-}

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C l^{-}

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S O_{4}^{2 -}

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C H_{3} C O O^{-}

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Solution

The correct option is D $C H_{3} C O O^{-}$
The strongest conjugate base will be formed from the weakest acid.
Acids from which these conjugate bases are formed are:
$(a) N O_{3}^{-} f r o m H N O_{3} (b) C l^{-} f r o m H C l (c) S O_{4}^{2 -} f r o m H S O_{4}^{-} (d) C H_{3} C O O^{-} f r o m C H_{3} C O O H$
We see that out of the four options $C H_{3} C O O H$ is the weakest acid and hence $C H_{3} C O O^{-}$ is the strongest conjugate base.

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