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On heating lead nitrate, brown fumes indicate the presence of which gas?

Answer and explanation

Correct answer: Nitrogen dioxide

Thermal decomposition of lead nitrate produces nitrogen dioxide, lead oxide, and oxygen: \(2\mathrm{Pb(NO_3)_2} \rightarrow 2\mathrm{PbO} + 4\mathrm{NO_2} + \mathrm{O_2}\). \(\mathrm{NO_2}\) is a brown gas, so the brown fumes indicate its presence. Oxygen is also formed, but it is colourless.

Related tags

ScienceClass 10Chemical ReactionsThermal DecompositionLead NitrateNitrogen Dioxide

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