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(A) The strength of oxyacids increases with the increase in the oxidation state of the central atom. In $ClO_3(OH)$ (which is $HClO_4$),the oxidation

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$ClO_3(OH)$

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(A) The strength of oxyacids increases with the increase in the oxidation state of the central atom. In $ClO_3(OH)$ (which is $HClO_4$),the oxidation state of $Cl$ is $+7$. In $ClO_2(OH)$ (which is $HClO_3$),the oxidation state of $Cl$ is $+5$. In $SO(OH)_2$ (which is $H_2SO_3$),the oxidation state of $S$ is $+4$. In $SO_2(OH)_2$ (which is $H_2SO_4$),the oxidation state of $S$ is $+6$. Comparing the oxidation states,$Cl$ in $HClO_4$ has the highest oxidation state $(+7)$ and is the most electronegative,making $ClO_3(OH)$ the strongest acid among the given options.

Which of the following substances is the strongest acid?

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