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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 colourless