During the qualitative analysis of $\mathrm{SO}_3^{2-}$ using dilute $\mathrm{H}_2 \mathrm{SO}_4, \mathrm{SO}_2$ gas is evolved which turns $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ solution (acidified with dilute $\mathrm{H}_2 \mathrm{SO}_4$ ):
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