Which is the strongest acid in the following?

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${HClO}_{4}$

$H_{2} {SO}_{3}$

$H_{2} {SO}_{4}$

${HClO}_{3}$

answer is A.

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Detailed Solution

$H \underline{\overset{+ 7}{Cl}} O_{4}$ with highest oxidation number and its conjugate base is resonance stabilised, hence it is most acidic. Cl is more electronegative than S.

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