Write down the steps of manufacturing nitric acid by Ostwald's process. [3 marks]

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Solution

Catalytic oxidation of ammonia: $4 N H_{3} (g) + 5 O_{2} (g) P t - - \to 800 ° c 4 N O (g) + 6 H_{2} O (l) + h e a t$ [1 mark]

Oxidation of nitric oxide: $2 N O (g) + O_{2} (g) 50 ° c - \to 2 N O_{2} (g)$ [1 mark]

Absorption of nitrogen dioxide: $4 N O_{2} (g) + 2 H_{2} O (l) + O_{2} (g) \to 4 H N O_{3} (a q)$ [1 mark]

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