Question:
Statement-I : Test for nitrite; sulphanilic acid and 1-napthylamine are used.
Statement-II : Acidified nitrite is di-azotized with sulphanilic acid and coupled with 1-napthylamine.
Select the correct statement.
Statement-I : Test for nitrite; sulphanilic acid and 1-napthylamine are used.
Statement-II : Acidified nitrite is di-azotized with sulphanilic acid and coupled with 1-napthylamine.
Select the correct statement.
Statement-II : Acidified nitrite is di-azotized with sulphanilic acid and coupled with 1-napthylamine.
Select the correct statement.
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This is a standard qualitative analysis spot test for $\text{NO}_2^-$. Formation of red azo dye confirms nitrite.
Updated On: Jan 29, 2026
- Both Statements are correct.
- Both Statements are incorrect.
- Statement I is correct but Statement II is incorrect.
- Statement I is incorrect but Statement II is correct.
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The Correct Option is A
Solution and Explanation
The Griess test is specific for nitrite ions.
Process:
1. Nitrite reacts with Sulphanilic acid in acidic medium to form a diazonium salt (Diazotization).
2. This diazonium salt couples with 1-Naphthylamine (or $\alpha$-naphthylamine) to form a red-colored azo dye.
Both statements accurately describe the reagents and the mechanism of the test.
Process:
1. Nitrite reacts with Sulphanilic acid in acidic medium to form a diazonium salt (Diazotization).
2. This diazonium salt couples with 1-Naphthylamine (or $\alpha$-naphthylamine) to form a red-colored azo dye.
Both statements accurately describe the reagents and the mechanism of the test.
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