In Ostwald process of manufacturing of $H N O_{3}$ catalyst used is:

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Solution

The correct option is D Pt
Ostwald process for manufacture of $H N O_{3}$
$4 N H_{3} + 5 O_{2} P t - \to 4 N O + 6 H_{2} O + Δ$
$2 N O + O_{2} 50^{o} C - -- \to 2 N O_{2 (g)}$
$3 N O_{2} + H_{2} O \to 2 H N O_{3} + O_{2}$
$∴$ Pt is used as catalyst in Ostwald process.

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