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(C) The strength of a conjugate base is inversely proportional to the strength of its corresponding acid. The order of acidic strength of the hydrohal

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$F^{-}$

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(C) The strength of a conjugate base is inversely proportional to the strength of its corresponding acid. The order of acidic strength of the hydrohalic acids is $HI > HBr > HCl > HF$. Therefore,the order of basic strength of their conjugate bases is $F^{-} > Cl^{-} > Br^{-} > I^{-}$. $F^{-}$ is the strongest conjugate base because $HF$ is the weakest acid among the given hydrohalic acids due to the high electronegativity and small size of the fluorine atom. The reaction is: $H^{+} + F^{-} 	o HF$.

The strongest conjugate base among the following is:

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