Ammonia - Using damp red litmus paper, changing from red to blue, Carbon dioxide - Using limewater, it turns from clear to milky Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l), Chlorine gas - Using blue damp litmus paper, blue first turns red and then bleaches to white, Hydrogen - Using a lighted splint, pop test, squeaky sound, Oxygen - Using a glowing splint and relight, Sulfur dioxide - Using aqueous potassium manganate VII, solution changes from purple to colourless, Water vapour - cobalt chloride paper, turns from blue to pink; or copper(II) sulfate (anhydrous), turns from white to blue,

Gas testing

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