In Dow's process, the starting raw material is

Dow process.

In Birkeland and Eyde process, the raw material used is :

In Brikeland-Eyde process, the raw material used is

In Brikeland-Eyde process, the raw material used is

Explain Dow 's process .

Discribe the principle for the manufacture of nitric acid by Ostwald's process. Mention the raw materials used in the process.