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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


Team Careers360 19th Jan, 2024
Answer (1)
Team Careers360 23rd Jan, 2024

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.

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