The strongest conjugate base is:

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(D) An acid loses a proton to form an anion known as its conjugate base.According to the Bronsted-Lowry theory,a strong acid forms a weak conjugate ba

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$F^{-}$

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(D) An acid loses a proton to form an anion known as its conjugate base.According to the Bronsted-Lowry theory,a strong acid forms a weak conjugate base,and a weak acid forms a strong conjugate base.Among the given halide ions $(F^{-}, Cl^{-}, Br^{-}, I^{-})$,the corresponding acids are $HF, HCl, HBr,$ and $HI$.$HI$ is the strongest acid and $HF$ is the weakest acid among these hydrohalic acids.Since $HF$ is the weakest acid,its conjugate base $F^{-}$ is the strongest conjugate base.

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