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Conjugate Acids and Bases

Which of the ...

Question

Which of the following acts as the strongest conjugate base?

C l^{-}

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

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S O_{4}^{2 -}

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N O_{2}^{-}

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Solution

The correct option is B $C H_{3} C O O^{-}$
Conjugate bases are formed by the removal of $H^{+}$ . Acids from which these conjugate bases are formed are :
A. $C l^{-} from H C l$
B. $C H_{3} C O O^{-} from C H_{3} C O O H$
C. $S O_{4}^{2 -} from H S O_{4}^{-}$
D. $N O_{2}^{-} from H N O_{2}$
Out of the four acids, $C H_{3} C O O H$ is the weakest acid of all, so the conjugate base formed by that acid is the strongest of the all.

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