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Heating calcium carbonate breaks it down into calcium oxide and carbon dioxide. This is an example of which type of decomposition?
APhoto decomposition
BElectrolytic decomposition
CThermal decomposition
DCatalytic decomposition
Answer & Solution
Correct answer: C. Thermal decomposition
1. Identify the energy source driving the decomposition: here it is heat.
2. Decomposition brought about by heat is thermal decomposition (thermolysis).
3. Photo decomposition uses light and electrolytic decomposition uses electric current, so those are ruled out.
4. Therefore heating calcium carbonate is a thermal decomposition.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 10 Types of Chemical Reactions "Thermal Decomposition Reactions", p.147_
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