Question

why no2 is brown in colour​

Answer 1

●It all depends on the frequencies of light the compounds reflect and absorb.

●That is why we see that Nitrogen gas is a white gas(if the gas if concentrated enough).

Answer 2

Nitric oxide is a colorless, flammable gas with a slight odor. Nitrogen dioxide is a deep red-orange gas that is poisonous but not flammable. It, along with aerosols, is responsible for the reddish-brown color of smog. At high concentrations it is highly toxic, and can cause serious lung damage.

NO2 is brown in colour.It all depends on the frequencies of light the compounds reflect and absorb. ... As for nitrogen dioxide, the molecules absorb a certain color. All the other colors are reflected as a brown color.