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The appearance of brown gas on heating lead nitrate identifies which gas?

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 brown fumes provide the identifying observation. Oxygen is colourless, hydrogen is colourless and combustible, and carbon dioxide is colourless and does not produce brown fumes. Thus option B is correct.

Related tags

ScienceClass10Thermal-DecompositionLead-NitrateNitrogen-DioxideChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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