The reaction of ${\mathrm{HClO}}_3$ with $\mathrm{HCl}$ gives a paramagnetic gas, which upon reaction with ${\mathrm{O}}_3$ produces

${\mathrm{HClO}}_3$ reacts with $\mathrm{HCl}$ according to the following equation,

$2{\mathrm{HClO}}_3+2\mathrm{HCl}⟶2{\mathrm{ClO}}_2+{\mathrm{Cl}}_2+2{\mathrm{H}}_2\mathrm{O}$

${\mathrm{ClO}}_2$ molecule is paramagnetic, as it contains odd number of electrons.

$2{\mathrm{ClO}}_2+2{\mathrm{O}}_3⟶{\mathrm{Cl}}_2{\mathrm{O}}_6+2{\mathrm{O}}_2$

ClO₂ is used as a bleaching agent for paper pulp and textiles and in water treatment