Chemistry Tests For SO2 Tests For SO2(g) Its irritating smell Action on oxidizing agents – It turns KMnO4(aq) from purple to colourless or KCrO7(aq) orange to green leaving no traces of sulphur. Was this helpful?👍 Yes👎 No ← Previous Chemical Properties of SO2 Next → Uses Of SO2 Leave a comment Cancel replyYou must be logged in to post a comment.