Discussion Forum



1)

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


A) NO

B) $NO_{2}$

C) $N_{2}O$

D) $N_{2}O_{4}$

Answer:

Option B

Explanation:

Plan NO2 is a brown coloured gas and imparts  this colour to  concentrated HNO3  due to long-standing  

$4HNO_{3}\rightarrow 2H_{2}0+2NO_{2}+3O_{2}$