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Why is it incorrect to identify the brown gas evolved on heating lead nitrate as oxygen?

Answer and explanation

Correct answer: Oxygen is colourless, whereas the brown gas is nitrogen dioxide
(
\(\mathrm{NO_2}\)
).

The thermal decomposition reaction is:
\[
2\mathrm{Pb(NO_3)_2} \rightarrow 2\mathrm{PbO} + 4\mathrm{NO_2} + \mathrm{O_2}
\]
Here,
\(\mathrm{NO_2}\)
is the brown gas, whereas
\(\mathrm{O_2}\)
is colourless. Therefore, the brown colour identifies
\(\mathrm{NO_2}\)
, not oxygen. Oxygen is indeed formed, but it is confirmed by rekindling a glowing splint, not by observing brown fumes.

Related tags

ScienceClass10Chemical-ReactionsThermal-DecompositionLead-NitrateGas-Identification

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