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Of the following compounds, which one is the strongest Bronsted acid in a aqueous solution?
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The correct answer is:
$\mathrm{HClO}_{3}$
$\because$ Higher be the oxidation number of central atom in oxo-acids, more strongly it behave as Bronsted-acid. Oxidation number for $\mathrm{Cl}$ in $\mathrm{HClO}_{3} \rightarrow+5$
Oxidation number for $\mathrm{Cl}$ in $\mathrm{HClO}_{2} \rightarrow+3$
Oxidation number for $\mathrm{Cl}$ in $\mathrm{HClO} \rightarrow+1$
Oxidation number for $\mathrm{Cl}$ in $\mathrm{HBrO} \rightarrow+1$
Hence, $\mathrm{HClO}_{3}$, is the strongest Bronsted acid in aqueous solution.
Oxidation number for $\mathrm{Cl}$ in $\mathrm{HClO}_{2} \rightarrow+3$
Oxidation number for $\mathrm{Cl}$ in $\mathrm{HClO} \rightarrow+1$
Oxidation number for $\mathrm{Cl}$ in $\mathrm{HBrO} \rightarrow+1$
Hence, $\mathrm{HClO}_{3}$, is the strongest Bronsted acid in aqueous solution.
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