How is nitrogen dioxide is converted into nitric acid?

Answer 1

Nitrogen present in Ammonia (NH3) is used to form nitric acid in by the Ostwald process. In this process, anhydrous ammonia is oxidized to nitric oxide, in the presence of platinum or rhodium gauge catalyst at a high temperature of about 500 K and a pressure of 9 bar.4 NH3 (g) + 5 O2 (g) → 4 NO (g) + 6 H2O (g) (ΔH = −905.2 kJ)

Nitric oxide is then reacted with oxygen in air to form nitrogen dioxide.2 NO (g) + O2 (g) → 2 NO2 (g) (ΔH = −114 kJ/mol)

This is subsequently absorbed in water to form nitric acid and nitric oxide.3 NO2 (g) + H2O (l) → 2 HNO3 (aq) + NO (g) (ΔH = −117 kJ/mol)

The nitric oxide is cycled back for reoxidation. Alternatively, if the last step is carried out in air:4 NO2 (g) + O2 (g) + 2 H2O (l) → 4 HNO3 (aq)

Answer 2

due to the action of nitrifying bacteria present in atmosphere

Answer 3

in plants like pea,beans etc. there is a fixation of rhizobium bacteria in their roots that convert the atmospheric nitrogen into forms of nitrates and nitrogenous salts.

Answer 4

The nitrogen dioxide reacts with water to form nitric acid.

Answer 5

There is two methods. They are by bacteria or lightning

Answer 6

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