Reagent, 1-naphthylamine and sulphanilic acid

Question:

Reagent, 1-naphthylamine and sulphanilic acid in acetic acid is used for the detection of

  1. $\mathrm{N}_{2} \mathrm{O}$

  2. $\mathrm{NO}_{3}{ }^{-}$

  3. NO

  4. $\mathrm{NO}_{2}^{-}$


Correct Option: , 4

Solution:

For detection of $\mathrm{NO}_{2}^{-}$, the following test is used. $\mathrm{NO}_{2}^{-}+\mathrm{CH}_{3} \mathrm{COOH} \rightarrow \mathrm{HNO}_{2}+\mathrm{CH}_{3} \mathrm{COO}^{-}$

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