The strongest Bronsted base among the following is:

C l O^{-}

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C l O_{2}^{-}

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C l O_{3}^{-}

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C l O_{4}^{-}

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Solution

The correct option is B $C l O^{-}$
As oxygen increases, the resonance of negative charge increases and therefore basicity decreases.
$C l O^{-} > C l O_{2}^{-} > C l O_{3}^{-} > C l O_{4}^{-}$
The acidic strength is: $H O C l < H C l O_{2} < H C l O_{3} < H C l O_{4}$ .

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C l O_{2} + S b O_{2}^{-} \to C l O_{2}^{-} + S b (O H)_{6}^{-}

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