Chemistry - Complete Pblock- Question with Solution | TestHub

The oxoacids of chlorine are classified based on the oxidation state of chlorine.

Hypochlorous acid (hypohalous acid): $\mathrm{HClO}$ (oxidation state $+1$)

Chlorous acid (halous acid): ${\mathrm{HClO}}_2$ (oxidation state $+3$)

Chloric acid (halic acid): ${\mathrm{HClO}}_3$ (oxidation state $+5$)

Perchloric acid (perhalic acid): ${\mathrm{HClO}}_4$ (oxidation state $+7$)

The halous acid of chlorine is chlorous acid, which has the molecular formula ${\mathrm{HClO}}_2$.

Answer: ${\mathrm{HClO}}_2$