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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsHard
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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.

Related tags

ScienceClass10Chemical-ReactionsThermal-DecompositionLead-NitrateHeatChemical Reactions And EquationsChemical Substances – Nature And Behaviour
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10 more MCQs
  1. 1What is the process called when one or more substances form new substances with different properties?
  2. 2Which of the following observations can be a common sign that a chemical reaction has occurred?
  3. 3What are the substances written on the left side of the arrow in a chemical equation called?
  4. 4What are the substances written on the right side of the arrow in a chemical equation called?
  5. 5Balancing a chemical equation is based on which law?
  6. 6What must be the same on the reactant and product sides of a balanced chemical equation?
  7. 7When two or more reactants combine to form a single product, what type of reaction is it?
  8. 8Calcium oxide reacts with water to form calcium hydroxide. What type of reaction is this?
  9. 9When a compound breaks down into two or more simpler substances, what type of reaction is it?
  10. 10When calcium carbonate is heated, it forms calcium oxide and carbon dioxide. What type of reaction is this?
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