1. Ammonia gas has a characteristic pungent, irritating odour.
2. It changes the colour of:a) Moist red litmus paper blue.
b) Turmeric paper brown.c) Methyl orange yellow.
d) Colourless phenolphthalein deep pink.3. A glass rod, dipped in concentrated hydrochloric acid when introduced into ammonia gas, produces thick white fumes of ammonium chloride.
4. It gives a white precipitate when bubbled through a solution of lead nitrate.5. It gives a light blue precipitate and then a deep blue solution when bubbled continuously through an aqueous solution of copper salt.
6. Ammonia gives a brown colour or precipitate when treated with Nessler's reagent.
