JEE Advanced | 2013p-Block elementsHard

Question

Concentrated nitric acid, upon long standing, turns yellow-brown due to the formation of -

Options

A.NO
B.NO2 
C.N2O
D.N2O4 

Solution

Conc. HNO3 decomposes partly on long standing in light as follows :
2HNO3 → H2O + 2NO2 + 1/2 O2
This NO2 gets dissolved in remaining HNO3 and turns its colour yellow-brown which is due to the paramagnetic behaviour of NO2.

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