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Which gas is identified by brown fumes in the decomposition of lead nitrate?

Answer and explanation

Correct answer: Nitrogen dioxide

On heating, lead nitrate decomposes according to 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂. Nitrogen dioxide, NO₂, is a reddish-brown gas, so its brown fumes provide a visible clue during the reaction. Oxygen is colourless, as are hydrogen and carbon dioxide under ordinary conditions. Therefore the gas identified by the brown fumes is nitrogen dioxide, making option B correct.

Related tags

ScienceClass10Decomposition ReactionNitrogen DioxideLead NitrateChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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