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While heating lead nitrate, a student identified the evolved brown gas as oxygen. What is the correct correction to the student's statement?

Answer and explanation

Correct answer: The brown gas is NO₂, and O₂ is colourless

On heating, lead nitrate decomposes according to 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂. Nitrogen dioxide (NO₂) is a brown gas, whereas oxygen (O₂) is colourless. Therefore, the student confused the two gaseous products, and option A gives the correct correction. The other statements reverse or misidentify their colours and formulas.

Related tags

Thermal DecompositionLead NitrateNitrogen DioxideChemical EquationsClass10 ScienceChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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