Which brown gas is evolved when lead nitrate is heated?
Answer and explanation
Correct answer: नाइट्रोजन डाइऑक्साइड
On heating, lead nitrate undergoes thermal decomposition to form lead oxide, nitrogen dioxide, and oxygen:
\[2\mathrm{Pb(NO_3)_2} \xrightarrow{\Delta} 2\mathrm{PbO}+4\mathrm{NO_2}+\mathrm{O_2}\]
\(\mathrm{NO_2}\) is a brown gas, so nitrogen dioxide is correct. Oxygen is also formed, but it is colourless.
Frequently asked questions
What is the correct answer to this question?
नाइट्रोजन डाइऑक्साइड
Why is this the correct answer?
On heating, lead nitrate undergoes thermal decomposition to form lead oxide, nitrogen dioxide, and oxygen:
\[2\mathrm{Pb(NO_3)_2} \xrightarrow{\Delta} 2\mathrm{PbO}+4\mathrm{NO_2}+\mathrm{O_2}\]
\(\mathrm{NO_2}\) is a brown gas, so nitrogen dioxide is correct. Oxygen is also formed, but it is colourless.
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.
