JEE Advanced · 2024 · 26 May 2024 · Paper 1 · p-Block Elements

At room temperature, disproportionation of an aqueous solution of in situ generated nitrous acid (

HNO_{2}

) gives the species

Answer: (A)

Solution

Nitrous acid undergoes disproportionation in aqueous solution according to the reaction:

3 HNO_{2} (aq) ⇌ H_{3} O^{+} + NO_{3}^{-} + 2 NO

. In this reaction, nitrogen in

HNO_{2}

(oxidation state +3) is both oxidized to

NO_{3}^{-}

(+5) and reduced to NO (+2), producing hydronium ion, nitrate ion, and nitric oxide.

JEE Advanced · 2024 · 26 May 2024 · Paper 1 · Single correct option