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Among the following, the weakest conjugate base is

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${OH}^{-}$

${SH}^{-}$

${SeH}^{-}$

${TeH}^{-}$

answer is D.

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Detailed Solution

${TeH}^{-}$ has the weakest conjugate base . The reason for this is because Tellurium belongs to Sixteenth group which can form strongest acid

The strongest acid corresponds to the weakest conjugate base

${OH}^{-}$ is not the weakest conjugate base because the hydroxide ion is released by water.

${SH}^{-}$ is not the weakest conjugate base because the ion is released by hydrogen sulphide gas not acid .

Thus, ${TeH}^{-}$ has the weakest conjugate base

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