Question

A colourless, neutral, paramagnetic oxide of Nitrogen ‘P’ on oxidation gives reddish brown gas Q. Q on cooling gives colourless gas R. R on reaction with P gives blue solid S. Identify P, Q, R, S respectively

• A. N₂O NO NO₂ N₂O₅
• B. N₂O NO₂ N₂O₄ N₂O₃
• C. NO NO₂ N₂O₄ N₂O₃
• D. NO NO N₂O₄ N₂O₅

Answer 1

The Correct Option is C

The paramagnetic oxide of nitrogen P is nitric oxide (NO). Upon oxidation, NO reacts with oxygen to form nitrogen dioxide (NO₂), which is a reddish-brown gas (Q).

• When NO₂ cools, it dissociates to form dinitrogen tetroxide (N₂O₄), which is a colorless gas (R).
• When NO reacts with N₂O₄ (R), it forms dinitrogen trioxide (N₂O₃), which is a blue solid (S).

So, the correct answer is (C) : NO NO₂ N₂O₄ N₂O₃.