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Question
Name the oxide of nitrogen which turns brown on exposure to air. How is it prepared?
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Solution
Oxide is NO (Nitric oxide).
This turns brown (NO2).
Preparation:
(i) Nitrogen and oxygen combine in the atmosphere during lightning discharge.
\[\ce{N2 + O2 <=> 2NO}\]
(ii) By oxidation of ammonia.
\[\ce{4NH3 + 5O2 ->[Pt][800^\circ C]4NO + 6H2O + Heat}\]
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