Assertion: Calcium carbonate when heated gives calcium oxide and water.
Reason: On heating calcium carbonate decomposition reaction takes place.

Dear student,
Option D is correct.
Assertion : Calcium carbonate when heated gives calcium oxide and water.This is false , because on heating calcium carbonate calcium oxide and carbon dioxide are formed.CaCO3------> CaO + CO2Reason :On heating calcium carbonate decomposition reaction takes place.This is also true.Assertion is false and Reason is true.

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