Among the following,the weakest base is

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(D) The strength of a conjugate base is inversely proportional to the strength of its corresponding acid.$HCl$ is a strong acid,therefore its conjugat

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$Cl^{-}$

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(D) The strength of a conjugate base is inversely proportional to the strength of its corresponding acid.$HCl$ is a strong acid,therefore its conjugate base $Cl^{-}$ is a very weak base.$H_{2}$,$CH_{4}$,and $CH_{3}OH$ are much weaker acids than $HCl$,making their conjugate bases ($H^{-}$,$CH_{3}^{-}$,and $CH_{3}O^{-}$) much stronger bases than $Cl^{-}$.Thus,$Cl^{-}$ is the weakest base among the given options.

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