AQA A -LEVEL CHEMISTRY CHEMICAL TESTS QUESTIONS AND ANSWERS WITH SOLUTIONS 2024 test for Carbon Dioxide (CO2 ) - ANSWER turns limewater milky (sparingly soluble Ca(OH) 2 forms insoluble CaCO3 ) Chlorine (Cl2 ) test - ANSWER bleaches damp litmus paper (Cl2 reacts with water to form HCl and HOCl) Hydrogen (H2 ) test - ANSWER pops with a lighted splint Oxygen (O2 ) test - ANSWER relights a glowing splint Carbonate (CO 3 2 - ) test - ANSWER add dilute acid; effervescence, carbon dioxide produced Sulfate (SO4 2 - ) test - ANSWER add dilute nitric acid then aqueous barium nitrate. Gives white precipitate Chloride (Cl - ) test - ANSWER add dilute nitric acid then aqueous silver nitrate. Gives white precipitate. Dissolves in dilute ammonia to give colourless solution (of [Ag(NH 3 ) 2 ] + ) Bromide (Br - ) test - ANSWER add dilute nitric acid then aqueous silver nitrate. Gives cream precipitate. Dissolves in concentrated ammonia but not in dilute ammonia Iodide (I - ) test - ANSWER add dilute nitric acid then aqueous silver nitrate. Gives yellow precipitate. Does not dissolve in either concentrated or dilute ammonia Iron II (Fe 2+ ) test - ANSWER add aqueous sodium hydroxide gives green precipitate, insoluble in excess Iron III (Fe 3+ ) test - ANSWER add aqueous sodium hydroxide gives orange/brown precipitate, insoluble in excess
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