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A brown gas is released on heating lead nitrate. Which gas is it?

Answer and explanation

Correct answer: Nitrogen dioxide

On strong heating, lead nitrate undergoes thermal decomposition: 2Pb(NO3)2 → 2PbO + 4NO2 + O2. Nitrogen dioxide, NO2, is a reddish-brown gas, so option B is correct. Oxygen is also produced in the reaction but is colourless, which is why it does not account for the brown fumes. Hydrogen and sulphur dioxide are not products of lead nitrate decomposition.

Related tags

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

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