Question

In the presence of platinum at ${800}^{0}C$ , ammonia reacts with oxygen to give X and water vapour. X then oxidizes to give reddish brown vapours of Y. What is X and Y?

• A. NO and NO₂
• B. NO₂ and NO
• C. N₂O₅ and NO
• D. N₂O and NO

Answer 1

The correct option is A

NO and NO₂

In the presence of platinum at ${800}^{0}C$, ammonia reacts with oxygen to give nitric oxide and water vapour.

$4N{H}_3+5O_2\stackrel{Pt,{800}^{0}C}{\to }6H_{2}O+4NO+Heat$

Reddish brown vapours of nitrogen dioxide are seen in the flask due to the oxidation of nitric oxide.

$2NO+O_2\to 2N{O}_2$

The platinum [catalyst] continues to glow even after the heating is discontinued since the catalytic oxidation of ammonia is an exothermic reaction.