The brown coloration in nitric acid prepared in the laboratory can be removed by?
A
heating the acid
B
bubbling air through the acid
C
cooling the acid
D
adding a decolorizing agent
E
adding a base
Verified Correct Answer: B.
Chemical Principles & Mechanism
The color of nitrogen dioxide is reddish brown. This nitrogen dioxide when comes in contact with acid appears yellow in color.
This means the color of nitric acid can be removed by bubbling air through acid.
Source: WAEC / JAMB / NECO Classroom Archive (Record #13964)