Question

Why nitric oxide before becomes brown when released in air?

Answer 1

Nitric Oxide is NO. In it the total no. of electrons are  15. This means that all electrons of NO are not paired and it is thus paramagnetic. The unpaired electron excites to a higher electron on gaining energy and when it comes back, it emits a photon of a specific wavelength corresponding to that of Brown colour in Visible Region.

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