Question:
Reagent, 1-naphthylamine and sulphanilic acid in acetic acid is used for the detection of :
Reagent, 1-naphthylamine and sulphanilic acid in acetic acid is used for the detection of :
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The Griess Test is highly sensitive and specifically detects the Nitrite ($NO_2^-$) ion in water and biological samples.
Updated On: Jan 21, 2026
- NO₂⁻
- NO₃⁻
- NO
- N₂O
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The Correct Option is A
Solution and Explanation
Step 1: This is the **Griess Test**.
Step 2: Nitrite ions ($NO_2^-$) react with sulphanilic acid to form a diazonium salt.
Step 3: This salt then couples with 1-naphthylamine to form a deep red/pink azo dye.
Step 4: Nitrates ($NO_3^-$) do not give this test directly unless reduced to nitrites first.
Step 2: Nitrite ions ($NO_2^-$) react with sulphanilic acid to form a diazonium salt.
Step 3: This salt then couples with 1-naphthylamine to form a deep red/pink azo dye.
Step 4: Nitrates ($NO_3^-$) do not give this test directly unless reduced to nitrites first.
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