When lead nitrate is heated, a solid residue and a brown gas are formed. Which pair is correct?
Answer and explanation
Correct answer: Lead oxide and nitrogen dioxide
Lead nitrate undergoes thermal decomposition: \(2\mathrm{Pb(NO_3)_2} \xrightarrow{\Delta} 2\mathrm{PbO} + 4\mathrm{NO_2} + \mathrm{O_2}\). The solid residue is lead oxide, \(\mathrm{PbO}\), and the brown gas is nitrogen dioxide, \(\mathrm{NO_2}\). Oxygen is also produced, but it is colourless, unlike the brown \(\mathrm{NO_2}\) gas.
Frequently asked questions
What is the correct answer to this question?
Lead oxide and nitrogen dioxide
Why is this the correct answer?
Lead nitrate undergoes thermal decomposition: \(2\mathrm{Pb(NO_3)_2} \xrightarrow{\Delta} 2\mathrm{PbO} + 4\mathrm{NO_2} + \mathrm{O_2}\). The solid residue is lead oxide, \(\mathrm{PbO}\), and the brown gas is nitrogen dioxide, \(\mathrm{NO_2}\). Oxygen is also produced, but it is colourless, unlike the brown \(\mathrm{NO_2}\) gas.
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.
