Physical Properties of SO2 by keypoint It is a colourless gas with irritating smell. It is poisonous It is denser than air It is very soluble in water It is easily liquefied under pressure. Others are Viewing: Chemical Properties of SO2 Sulphur (iv) oxide (SO2) Tests For SO2 Uses Of SO2 Physical Properties of Hydrogen Physical Properties Of NO2 Physical Properties Of H2SO4