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a, , - AMMONIA GAS - Combustibility, , Ammonia is ~ neither combustible nor a, Reaction with oxygen, , , , , , , , , , , , supporter of combustion, , , , , , , monia burns in ana :, on tmosphere of oxygen and undergoes catalytic oxidation., , URNING OF AMM, B ONIA IN OXYGEN | CATALYTIC OXIDATION OF AMMONIA, , REACTION REACTION, H.+30, 4NH3 + 302 ——> 2N) + 6H,O | 4NH, + 50, ght 4NO + 6HZO +A, , nitric oxide steam, [Starting reaction for - Ostwald’s process manufacture of - nitric acid], , , , , , , , , , , , , , , Green or, greenish, yellow flame, , , , , , , , , , Platinum, [catalyst], , , , , , , Cotton, Wool, , , , , , , , On gas >, NH3 gas >, , , , , , , Ammonia burns in excess oxygen Catalytic oxidation of ammonia, PROCEDURE : PROCEDURE:, , * Pass dry ammonia gas through ¢ Pass dry ammonia gas & oxygen gas, tube A & - through inlets [A & B] ignite the gas at the nozzle end [x] respectively in the ratio 1:2, , , , , , , , , , , , , , , , , , , , , , , , * Pass oxygen gas through, tube-B & reignite the ammonia gas at the, nozzle end [xX]., , ¢ Theammonia-oxygen mixture passes, over heated platinum placed in the combustion tube which in the heated, state emits a reddish glow., OBSERVATIONS :, , , , , , , , , , , , , , , , , , OBSERVATIONS :, * Dry ammonia gas passed through | + The colourless nitric oxide formed,, the ignition tube A&- on oxidation gives reddish brown , , , , , , nitrogen dioxide in the flask ’C’., ¢ Theplatinum [catalyst] continues to glow, evenafter the heating is discontinued, sincethecatalyticoxidation ofammonia, is an — exothermic reaction., , , , , ignited, alone does not burn., , , , , , , , , , , * After passage of oxygen, ammonia, burns in an atmosphere of excess, oxygen with a - green or greenish, yellowflameforming - nitrogen & water.