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When lead nitrate is heated, a brown gas evolves and a solid residue remains. Which explanation is correct?

Answer and explanation

Correct answer: The brown gas is nitrogen dioxide, the solid residue is lead oxide, and oxygen is also evolved.

Lead nitrate undergoes thermal decomposition on heating:
\[
2\mathrm{Pb(NO_3)_2} \xrightarrow{\Delta} 2\mathrm{PbO} + 4\mathrm{NO_2} + \mathrm{O_2}
\]
\(\mathrm{NO_2}\) is the brown gas, and \(\mathrm{PbO}\) is the solid residue. Although \(\mathrm{O_2}\) is also formed, it is colourless, so it cannot be the brown gas.

Related tags

ScienceClass10Chemical ReactionsThermal DecompositionLead NitrateNitrogen Dioxide

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