What is the role of heat in the reaction of heating lead nitrate?
Answer and explanation
Correct answer: Heat is a condition that starts the reaction
When lead nitrate is heated, it undergoes thermal decomposition: 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂. Heat is supplied as an external condition to provide the energy needed for decomposition; it is not one of the products. The reaction produces lead oxide, brown nitrogen dioxide gas, and oxygen. Therefore, option B correctly describes the role of heat.
Frequently asked questions
What is the correct answer to this question?
Heat is a condition that starts the reaction
Why is this the correct answer?
When lead nitrate is heated, it undergoes thermal decomposition: 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂. Heat is supplied as an external condition to provide the energy needed for decomposition; it is not one of the products. The reaction produces lead oxide, brown nitrogen dioxide gas, and oxygen. Therefore, option B correctly describes the role of heat.
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.
