Question

A gas bulb is filled with $N{O}_2$ gas and immersed in an ice bath at $0^{\circ }C$ which becomes colourless after sometimes. This colourless gas will be

• A. $N_2{O}_5$
• B. $N_2{O}_4$
• C. $N_{2}O$
• D. $N{O}_2$

Answer 1

The correct option is B

$N_2{O}_4$

$\underset{\left({100}^{\circ }C\right)}{\underset{\text{Reddish Brown}}{2N{O}_2}}\stackrel{Cooling}{\to }\underset{\left(0^{\circ }C\right)}{\underset{\text{Colourless}}{N_2{O}_4}}$