Assertion when calcium carbonate is heated it decomposes to give calcium oxide and carbon dioxide reason decomposition reaction take place on application of heat therefore it is an endothermic reaction
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both assertion and reason are true and reason is the correct explanation of assertion
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both a and r are true and r is the correct explanation of a because when we heat CaCO3 ------heat-----> CaO + CO2 and thus it requires heat therefore it is an endothermic reaction also .
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