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When lead nitrate is heated, it decomposes to form lead oxide, nitrogen dioxide, and oxygen. Which gas is brown in colour?

Answer and explanation

Correct answer: Nitrogen dioxide

This is a thermal decomposition reaction: 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂. Nitrogen dioxide, NO₂, is a reddish-brown gas, so option B is correct. The oxygen released is colourless, nitrogen is also colourless, and nitric oxide is not the brown gas produced in this reaction. The observation of brown fumes is therefore a useful test for NO₂.

Related tags

Nitrogen DioxideChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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