The thermally most stable compound is:

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(A) The thermal stability of oxyacids of chlorine increases with the increase in the oxidation state of the central chlorine atom. The oxidation state

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$HOClO_3$

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(A) The thermal stability of oxyacids of chlorine increases with the increase in the oxidation state of the central chlorine atom. The oxidation states of $Cl$ in the given compounds are: $HOClO_3$ $(+7)$,$HOClO_2$ $(+5)$,$HOClO$ $(+3)$,and $HOCl$ $(+1)$. Therefore,the decreasing order of thermal stability is: $HOClO_3 > HOClO_2 > HOClO > HOCl$. Thus,$HOClO_3$ is the most stable compound.

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