2021 · Q97
When we heat lead nitrate [Pb(NO3)2] in a boiling tube, we observe the emission of brown fumes. Which one of the following is the brown gas?
General KnowledgeChemistry
- ANO
- BN2O2
- CNO3
- DNO2
Explanation
On heating, lead nitrate decomposes as 2Pb(NO3)2 → 2PbO + 4NO2 + O2, evolving brown fumes of nitrogen dioxide (NO2). The observed brown gas is NO2; NO, N2O2 and NO3 are not the products of this decomposition.