A) \[NO\]
B) \[N{{O}_{2}}\]
C) \[{{N}_{2}}{{O}_{4}}\]
D) \[{{N}_{2}}{{O}_{5}}\]
Correct Answer: A
Solution :
Nitric oxide, NO, a colourless gas, when comes in contact of air, turns brown due to its oxidation into \[\text{N}{{\text{O}}_{\text{2}}}\](which is brown in colour). \[\underset{\text{colourless}}{\mathop{2NO}}\,+\underset{(from\,air)}{\mathop{{{O}_{2}}}}\,\xrightarrow{{}}\underset{\text{brown}}{\mathop{2N{{O}_{2}}}}\,\]
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