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Q. The colourless gas that turns brown in air is

J & K CETJ & K CET 2010The p-Block Elements - Part2

Solution:

Nitric oxide, $NO$, a colourless gas, when comes in contact of air, turns brown due to its oxidation into $NO _{2}$ (which is brown in colour).
$\underset{\text { colourless }}{2 NO }+\underset{\text { (fromair) }}{ O _{2}} \rightarrow \underset{\text { brown }}{2 NO _{2}}$