Chemistry - Salt Analysis Question with Solution | TestHub

The formation of the red azo dye shown occurs when nitrites (${N{O}_2}^{-}$) react with sulfanilic acid and 1-naphthylamine. This specific chemical reaction is known as the Griess-Ilosvay test, which is a highly sensitive method for detecting the presence of nitrite ions. The characteristic red coloration results from the diazotization of sulfanilic acid followed by its coupling with 1-naphthylamine. Thus, the correct option is (B).