Write chemical equations, to obtain nitric acid from ammonia gas by Ostwald’s process.

Ostwald’s process:

i. Ammonia gas is used in the preparation of nitric acid by this method.

ii. First, ammonia and dioxygen gas react together over platinum catalyst to form nitric oxide (NO)

iii. Now, nitric oxide formed above combines with oxygen to form fumes of nitrogen dioxide (NO₂)

2NO + O₂→ 2NO₂

iv. The nitrogen dioxide reacts with water to form nitric acid.

NO₂ + H₂O → HNO₃

Nitric acid