Which of the following is a decomposition reaction but not a photolytic decomposition reaction?
Answer and explanation
Correct answer: Heating calcium carbonate
When calcium carbonate is heated, it decomposes into calcium oxide and carbon dioxide: \(\mathrm{CaCO_3 \xrightarrow{\Delta} CaO + CO_2}\). This is thermal decomposition because heat causes the breakdown, not light. Silver chloride and silver bromide undergo photolytic decomposition in sunlight. In contrast, iron reacting with copper sulfate is a displacement reaction.
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What is the correct answer to this question?
Heating calcium carbonate
Why is this the correct answer?
When calcium carbonate is heated, it decomposes into calcium oxide and carbon dioxide: \(\mathrm{CaCO_3 \xrightarrow{\Delta} CaO + CO_2}\). This is thermal decomposition because heat causes the breakdown, not light. Silver chloride and silver bromide undergo photolytic decomposition in sunlight. In contrast, iron reacting with copper sulfate is a displacement reaction.
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.
