Which of the following is the strongest acid?

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(C) The strength of oxoacids is determined by the number of non-hydroxylated oxygen atoms attached to the central atom. Greater the number of such oxy

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$ClO_3(OH)$

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(C) The strength of oxoacids is determined by the number of non-hydroxylated oxygen atoms attached to the central atom. Greater the number of such oxygen atoms,higher is the oxidation state of the central atom and stronger is the acid. $A$: $SO(OH)_2$ is $H_2SO_3$ (Sulfurous acid). $B$: $SO_2(OH)_2$ is $H_2SO_4$ (Sulfuric acid). $C$: $ClO_3(OH)$ is $HClO_4$ (Perchloric acid). $D$: $PO(OH)_3$ is $H_3PO_4$ (Phosphoric acid). Among these,$HClO_4$ has the highest oxidation state of chlorine $(+7)$ and the most non-hydroxylated oxygen atoms,making it the strongest acid.

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