Question

Give at least two tests to differentiate between the following gases.

CO₂ and SO₂

Answer 1

Test	CO2	SO2
1. Acidified potassium permanganate test	No change in colour; the purple solution remains purple.	Decolours acidified KMnO4 solution.
2. Acidified potassium dichromate test	No change in colour; the orange solution remains orange.	Turns acidified K2Cr2O7 solution from orange to green.