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Q. The strongest bronsted base among the following anions is

AIIMSAIIMS 1996The p-Block Elements - Part2

Solution:

Strongest acid among $HClO _{4}, HClO _{3}, HClO _{2}$ and $HClO$ is $HClO _{4}$ (due to greater no. of attached $O-$ atoms) and weakest is $HClO$. But the corresponding conjugate base of $HClO$ i.e. $ClO ^{-}$ is the strongest Bronsted base.