Question

What do you observes when:
Sulphur dioxide is passed through acidified Potassium dichromate solution?

Answer 1

Sulfur dioxide react with potassium dichromate and sulfuric acid

$S{O}_2+K_{2}C{r}_2{O}_7+3H_{2}S{O}_4\to K_{2}S{O}_4+C{r}_2(S{O}_4{)}_3+3H_{2}O$

Sulfur dioxide react with potassium dichromate and sulfuric acid to produce potassium sulfate, chromium(III) sulfate and water and the solution turns from orange to green.