Q19 / 75 · JEE Main 2026 (28 January Shift 1) · Chemistry
Given below are two statements:
Statement I: Griss-Ilosvay test is used for the detection of nitrite ion, which involves the use of sulphanilic acid and $\alpha$-naphthylamine reagent.
Statement II: In the above test, sulphanilic acid is diazotized by the acidified nitrite ion, which on further coupling with $\alpha$-naphthylamine forms an azo-dye.
In the light of the above statements, choose the correct answer from the options given below
Statement I: Griss-Ilosvay test is used for the detection of nitrite ion, which involves the use of sulphanilic acid and $\alpha$-naphthylamine reagent.
Statement II: In the above test, sulphanilic acid is diazotized by the acidified nitrite ion, which on further coupling with $\alpha$-naphthylamine forms an azo-dye.
In the light of the above statements, choose the correct answer from the options given below
- Correct answerABoth Statement I and Statement II are true
- BBoth Statement I and Statement II are false
- CStatement I is false but Statement II is true
- DStatement I is true but Statement II is false
Solution
The Griss-Ilosvay test for nitrite ion detection involves adding sulphanilic acid and $\alpha$-naphthylamine reagent. Acidified nitrite ions diazotize sulphanilic acid, forming a diazonium salt that undergoes azo coupling with $\alpha$-naphthylamine to produce a characteristic red azo-dye. Both statements accurately describe this test and its mechanism, making both statements true.
Hence, the correct answer is option: 'A'.