Which of the following is the weakest base as per the Bronsted concept ?

[C l O_{4}]^{-}

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[C l O_{3}]^{-}

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[C l O_{2}]^{-}

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[C l O]^{-}

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Solution

The correct option is A $[C l O_{4}]^{-}$
The Bronsted-Lowry definition of an acid is a proton donator and a base is a proton acceptor.

According to Bronsted concept, conjugate base of strongest acid is weakest.
order of acidity $H C l O_{4} > H C l O_{3} > H C l O_{2} > H C l O$
so weakest base is $C l O_{4}^{-}$ .

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