(i) How can ammonia be converted to NO₂ and nitric acid?
(ii) What is liquor ammonia?

(i) When ammonia is oxidised by heating with oxygen to 1073 K in the presence of platinum gauze, reddish brown vapours of NO₂ are formed.
4NH₃ + 5O₂ 4NO + 6H₂O2NO + O₂ 2NO₂
When NO₂ dissolves in water, nitric acid is formed.
2NO₂ + H₂O+ O 2HNO₃
Thus HNO₃ is manufactured from ammonia.(ii) A saturated solution of ammonia is known as liquor ammonia.