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What is the correct set of brown gas and colourless gas formed on heating lead nitrate?

Answer and explanation

Correct answer: Nitrogen dioxide and oxygen

Heating lead nitrate causes thermal decomposition: 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂. Nitrogen dioxide is the characteristic brown gas, while oxygen is colourless. The order in option A matches the question’s order—brown gas followed by colourless gas. Option B reverses the gases, and the other choices contain gases not produced by lead nitrate decomposition.

Related tags

ScienceClass10Chemical-ReactionsLead-NitrateNitrogen-DioxideChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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