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Which pair correctly identifies the brown gas and the solid residue formed on heating lead nitrate?

Answer and explanation

Correct answer: Nitrogen dioxide and lead oxide

Lead nitrate undergoes thermal decomposition: \(2\mathrm{Pb(NO_3)_2} \xrightarrow{\Delta} 2\mathrm{PbO} + 4\mathrm{NO_2} + \mathrm{O_2}\). Here, \(\mathrm{NO_2}\) is the brown gas and \(\mathrm{PbO}\) is the solid residue. Option B is incorrect because calcium oxide is not formed during the decomposition of lead nitrate.

Related tags

ScienceClass10Chemical ReactionsThermal DecompositionLead NitrateNitrogen Dioxide

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