Oxygen - Colourless gas which relights a glowing splint
CO2 - Colourless gas which gives a white precipitate with limewater (calcium hydroxide solution)
Ammonia - Colourless gas which turns moist red litmus paper blue and forms white smoke with hydrogen chloride
NO2 - Brown gas, insoluble in organic solvents
Hydrogen - Colourless gas which ignites with a pop
Hydrogen chloride - Steamy fumes on exposure to moist air, acidic and forms white smoke with ammonia
Chlorine - Pale green gas which bleaches moist litmus paper
Bromine - Brown gas, soluble in organic solvents to form a brown solution
Iodine - Purple vapour
Water vapour - Turns blue cobalt chloride paper pink
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