JAMB - Chemistry (1981 - No. 15)
The brown coloration in nitric acid prepared in the laboratory can be removed by?
heating the acid
bubbling air through the acid
cooling the acid
adding a decolorizing agent
adding a base
Vysvětlení
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.