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Why is it incorrect to identify the brown fumes observed on heating lead nitrate as oxygen?

Answer and explanation

Correct answer: The brown fumes are nitrogen dioxide, whereas oxygen is colourless.

Thermal decomposition of lead nitrate produces brown nitrogen dioxide gas as well as colourless oxygen:
\(2\mathrm{Pb(NO_3)_2} \xrightarrow{\Delta} 2\mathrm{PbO}+4\mathrm{NO_2}+\mathrm{O_2}\).
Therefore, the visible brown fumes are \(\mathrm{NO_2}\), not oxygen. Oxygen is indeed formed in the reaction, but it is colourless and cannot be identified as brown fumes.

Related tags

ScienceClass10Chemical ReactionsThermal DecompositionLead NitrateNitrogen Dioxide

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