Which of the following is the strongest base?

C l O_{2}^{-}

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C l O_{3}^{-}

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C l O^{-}

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C l O_{4}^{-}

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Solution

The correct option is C $C l O^{-}$
Brønsted bases are those that can accept a proton (hydrogen ion).
We know that, stronger the acid weaker is the conjugate base. Now, the order of acidic strength is $H C l O_{4} > H C l O_{3} > H C l O_{2} > H C l O$ .
Hence, $C l O^{-}$ will be the strongest Brønsted base.

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