Answer:
Nitric oxide (NO) is a colourless
gas. When released in air, it immediately changes to nitrogen dioxide \[(N{{O}_{2}})\]
which has a brown colour.
\[\underset{\text{(Colourless)}}{\mathop{2NO(g)}}\,+{{O}_{2}}(g)\xrightarrow{\,}\,\underset{\text{(Brown)}}{\mathop{2N{{O}_{2}}(g)}}\,\]
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