The correct order of acid strength is

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(A) The acidic strength of oxoacids of chlorine depends on the oxidation state of the central chlorine atom. As the oxidation number of the central at

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$HClO < HClO_2 < HClO_3 < HClO_4$

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(A) The acidic strength of oxoacids of chlorine depends on the oxidation state of the central chlorine atom. As the oxidation number of the central atom increases,the electron density on the oxygen atom decreases,which facilitates the release of the $H^+$ ion. The oxidation states are: $HClO (+1)$,$HClO_2 (+3)$,$HClO_3 (+5)$,and $HClO_4 (+7)$. Therefore,the correct order of acid strength is $HClO < HClO_2 < HClO_3 < HClO_4$.

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