Statement I: Griss-Ilosvay test is used for the detection of nitrite ion, which involves the use of sulphanilic acid and α-naphthylamine reagent. Statement II: In the above test, sulphanilic acid is diazotized by the acidified nitrite ion, which on further coupling with α-naphthylamine forms an azo-dye.

Given below are two statements: Griss-Ilosvay test is used for the detection of nitrite ion, which involves the use of sulphanilic acid and α-naphthylamine reagent. Statement II: In the above test, sulphanilic acid is diazotized by the acidified nitrite ion, which on further coupling with α-naphthylamine forms an azo-dye.

Q. 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 α-naphthylamine reagent.

Statement II: In the above test, sulphanilic acid is diazotized by the acidified nitrite ion, which on further coupling with α-naphthylamine forms an azo-dye.

In the light of the above statements, choose the correct answer from the options given below.

(A) Statement I is true but Statement II is false

(B) Both Statement I and Statement II are false

(D) Both Statement I and Statement II are true

Correct Answer: (D)

Explanation

Griss-Ilosvay test is a confirmatory test for the detection of nitrite ions. In this test, sulphanilic acid reacts with nitrite ion in acidic medium to form a diazonium salt.

This diazonium compound then undergoes coupling reaction with α-naphthylamine to produce a coloured azo-dye, which confirms the presence of nitrite ion.

Thus, the test indeed uses sulphanilic acid and α-naphthylamine, and the mechanism involves diazotization followed by azo-coupling.

Hence, both Statement I and Statement II are correct.

Explanation

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