(D) The Ostwald process involves the catalytic oxidation of ammonia $(NH_3)$ to nitric oxide $(NO)$.The reaction is: $4NH_3(g) + 5O_2(g) \xrightarrow{

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(D) The Ostwald process involves the catalytic oxidation of ammonia $(NH_3)$ to nitric oxide $(NO)$.The reaction is: $4NH_3(g) + 5O_2(g) \xrightarrow{Pt/Rh \text{ catalyst}} 4NO(g) + 6H_2O(g)$.In this process,a platinum-rhodium $(Pt/Rh)$ gauze is used as a catalyst to facilitate the reaction.