Question : Which among the following is added to commercial nitric acid to make it coloured?
Option 1: Carbon dioxide
Option 2: Sulphur dioxide
Option 3: Coloured impurities
Option 4: Nitrogen dioxide
Correct Answer: Nitrogen dioxide
Solution : The correct option is Nitrogen dioxide .
Nitrogen dioxide (NO 2 ) is used to give nitric acid a brownish colour in commercial manufacture. Because of the presence of dissolved nitrogen dioxide gas in the solution, this is a distinguishing feature of fuming or concentrated nitric acid.
Related Questions
Know More about
Staff Selection Commission Sub Inspector ...
Result | Eligibility | Application | Selection Process | Cutoff | Admit Card | Preparation Tips
Get Updates Brochure
Your Staff Selection Commission Sub Inspector Exam brochure has been successfully mailed to your registered email id “”.
