The catalyst used in the manufacture of $H N O_{3}$ by Ostwald's process is

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Solution

Ostwald’s process is the industrial process to manufacture nitric acid in bulk.
Step $1$ : The first step involves the oxidation of ammonia which forms nitric oxide.
$4 N H_{3} (g) + 5 O_{2} (g) P t / R h g a u g e c a t a l y s t - ------------ \to 500 K, 9 b a r 4 N O (g) + 6 H_{2} O (g)$
Step $2$ : The nitric oxide so formed, combines with oxygen to give $N O_{2}$ .
$2 N O (g) + O_{2} (g) \to 2 N O_{2} (g)$
Step $3$ : Subsequently, nitrogen dioxide is dissolved in water to produce adequate concentrations of nitric acid.
$3 N O_{2} (g) + H_{2} O (l) \to 2 H N O_{3} (a q) + N O (g)$

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