What is the correct set of brown gas and colourless gas formed on heating lead nitrate?
Answer and explanation
Correct answer: Nitrogen dioxide and oxygen
Heating lead nitrate causes thermal decomposition: 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂. Nitrogen dioxide is the characteristic brown gas, while oxygen is colourless. The order in option A matches the question’s order—brown gas followed by colourless gas. Option B reverses the gases, and the other choices contain gases not produced by lead nitrate decomposition.
Frequently asked questions
What is the correct answer to this question?
Nitrogen dioxide and oxygen
Why is this the correct answer?
Heating lead nitrate causes thermal decomposition: 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂. Nitrogen dioxide is the characteristic brown gas, while oxygen is colourless. The order in option A matches the question’s order—brown gas followed by colourless gas. Option B reverses the gases, and the other choices contain gases not produced by lead nitrate decomposition.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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