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The brown gas on heating lead nitrate indicates the presence of which substance?

Answer and explanation

Correct answer: Nitrogen dioxide

On heating, lead nitrate undergoes thermal decomposition: 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂. Nitrogen dioxide, NO₂, is a reddish-brown gas, so its characteristic colour identifies it as the gas observed. Oxygen is colourless, hydrogen is also colourless and is not produced in this decomposition, and carbon dioxide is not a product of lead nitrate decomposition. Therefore option C is correct.

Related tags

ScienceClass 10Thermal DecompositionLead NitrateNitrogen DioxideChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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