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

We need to evaluate two statements about the Griss-Ilosvay test for nitrite ion.

Statement I: The Griss-Ilosvay test uses sulphanilic acid and α-naphthylamine for nitrite detection.

This is TRUE. This is the standard reagent combination for the test.

Statement II: Sulphanilic acid is diazotized by acidified nitrite ion, which then couples with α-naphthylamine to form an azo dye.

This is TRUE. The nitrite first diazotizes sulphanilic acid to form a diazonium salt, which then couples with α-naphthylamine to produce a red/orange azo dye.

Both statements are true, which corresponds to Option 4.