Chemistry - Complete Pblock- Question with Solution | TestHub

Oxygen is more electronegative than chlorine. With an increase in the number of $\mathrm{O}$ atoms attached to $\mathrm{Cl}$, more electrons are pulled away from $\mathrm{O}-\mathrm{H}$ bond and weaker becomes the $\mathrm{O}-\mathrm{H}$ bond. This increases the acid strength. The decreasing order of acidic strength is $\mathrm{HClO}<{\mathrm{HClO}}_2<$ ${\mathrm{HClO}}_3<{\mathrm{HClO}}_4$