A substance on treatment with dilute $\mathrm{H}_{2} \mathrm{SO}_{4}$ liberates a colourless gas whi

Question

A substance on treatment with dilute $\mathrm{H}_{2} \mathrm{SO}_{4}$ liberates a colourless gas which produces\ (i) turbidity with baryta water and\ (ii) turns acidified dichromate solution green. These reactions indicate the presence of\

Professor PC Thomas Classes · Answer

$\mathrm{SO}_{3}^{2-}+2 \mathrm{H}^{+} ightarrow \mathrm{SO}_{2}+\mathrm{H}_{2} \mathrm{O}$\ ( $\mathrm{SO}_{2}$ turns dichromate green)\ $\mathrm{SO}_{3}^{2-}+\mathrm{Ba}^{2+} ightarrow \mathrm{BaSO}_{3}$ (white ppt).\