ReasoningModerate1 mark
6(iii)
Anil is a laboratory assistant in a college. He prepared nitric acid but stored it in a transparent container exposed to sunlight. After a few days, brown fumes were observed in the container and the acid turned slightly yellowish in colour.
Why were brown fumes observed in the container?
Topic: Metallurgy, ores, extraction and alloys
Previous-year question practice database
Answer
Exam answer
HNO₃ decomposes in light to form reddish-brown NO₂: 4HNO₃ → 4NO₂ + 2H₂O + O₂.