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Question
Name the oxide of nitrogen which turns brown on exposure to air. How is it prepared?
Solution
The oxide of nitrogen, which turns brown on exposure to air, is nitric oxide
This turns brown \[\ce{(NO2)}\] by catalytic oxidation of ammonia.
\[\ce{4NH3 + 5O2 ->[Pt][800°C]4NO + 6H2O + Heat}\]
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