Question:

At room temperature, disproportionation of an aqueous solution of in situ generated nitrous acid (HNO₂) gives the species

JEE Advanced - 2024
JEE Advanced

Updated On: Mar 7, 2025

H₃O⁺, NO₃^- and NO
H₃O⁺, NO₃^- and NO₂
H₂O⁺, NO^- and NO₂
H₃O⁺, NO₃^- and N₂O

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The Correct Option is A

Solution and Explanation

Step 1: Reaction of Nitrous Acid

The disproportionation of nitrous acid (\( HNO_2 \)) occurs as:

\[ 2HNO_2 \rightarrow NO_3^- + NO + H_3O^+ \]

Step 2: Products of the Reaction

The products include:

\( H_3O^+ \) (Hydronium ion)
\( NO_3^- \) (Nitrate ion)
\( NO \) (Nitric oxide)

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At room temperature, disproportionation of an aqueous solution of in situ generated nitrous acid (HNO2) gives the species