Which gas causes the brown fumes when lead nitrate is heated?
Answer and explanation
Correct answer: Nitrogen dioxide
On heating, lead nitrate undergoes thermal decomposition: \(2\mathrm{Pb(NO_3)_2} \rightarrow 2\mathrm{PbO} + 4\mathrm{NO_2} + \mathrm{O_2}\). The \(\mathrm{NO_2}\) formed is a brown gas, so it produces the brown fumes. \(\mathrm{O_2}\) is also produced, but it is colourless.
Frequently asked questions
What is the correct answer to this question?
Nitrogen dioxide
Why is this the correct answer?
On heating, lead nitrate undergoes thermal decomposition: \(2\mathrm{Pb(NO_3)_2} \rightarrow 2\mathrm{PbO} + 4\mathrm{NO_2} + \mathrm{O_2}\). The \(\mathrm{NO_2}\) formed is a brown gas, so it produces the brown fumes. \(\mathrm{O_2}\) is also produced, but it is colourless.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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