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Q. In which of the following compounds does chlorine have the highest oxidation number?

NTA AbhyasNTA Abhyas 2022

Solution:

Let the oxidation state of chlorine be $X$ in $HClO_{4}$ .
So, the oxidation state of $Cl$ can be calculated as:
$+1+X+\left(\right.-8\left.\right)=0\therefore X=+7$
So, $Cl$ has the highest oxidation number compared to other compounds.