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JEE Main Chemistry Amines 2026 JEE Main 2026 (28 January Shift 1)

JEE Main Chemistry Question (2026) — Solution

Question

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 -naphthylamine reagent. Statement II : In the above test, sulphanilic acid is diazotized by the acidified nitrite ion, which on further coupling with -naphthylamine forms an azo-dye. In the light of the above statements, choose the correct answer from the options given below

Options

  1. A. Both Statement I and Statement II are true
  2. B. Both Statement I and Statement II are false
  3. C. Statement I is false but Statement II is true
  4. D. Statement I is true but Statement II is false

Answer

A. Both Statement I and Statement II are true

Step-by-step solution

The Griss-Ilosvay test for nitrite ion detection involves adding sulphanilic acid and -naphthylamine reagent. Acidified nitrite ions diazotize sulphanilic acid, forming a diazonium salt that undergoes azo coupling with -naphthylamine to produce a characteristic red azo-dye. Both statements accurately describe this test and its mechanism, making both statements true.

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