ammonia, NH3
carbon dioxide, CO2
chlorine, Cl2
hydrogen, H2
oxygen, O2
sulfur dioxide, SO2
ammonia, NH3

turns damp red litmus paper blue

carbon dioxide, CO2

turns limewater milky

chlorine, Cl2

bleaches damp litmus paper

hydrogen, H2

‘pops’ with a lighted splint

oxygen, O2

relights a glowing splint

sulfur dioxide, SO2

turns acidified aqueous potassium manganate(VII) from purple to colorless