A white precipitate was formed when ${\mathrm{BaCl}}_2$ when added to water extract of ${\mathrm{SO}}_3^{-2}$ salt. which is an inorganic salt.$\mathrm{white} \mathrm{pracipitate} \mathrm{of} {\mathrm{BaSO}}_3$ is formed. Further, a gas ${\mathrm{SO}}_2$ with burning sulphur like odour will be released when the${\mathrm{BaSO}}_3$ is  dissolved in dilute HCI.