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  4. Large-scale manufacture of nitric acid by Ostwald process utilizes the reaction

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Q. Large-scale manufacture of nitric acid by Ostwald process utilizes the reaction

The p-Block Elements - Part2

Solution:

The restricted oxidation of $NH_3$ can be done with air, when the mixture is passed over heated platinum gauze at $700^{\circ}C$ to $800^{\circ}C$.
$4NH_3 + 5O_2 \rightarrow 4NO + 6H_2O + \underset{\text{Calories}}{21,600}$
$2NO + O_2 \rightarrow 2NO_2$
$3NO_2 + H_2O \rightarrow 2HNO_3 + NO$
This is the Ostwald’s process used for manufacture of $HNO_3$