alleryConsider the reaction CaCO$_3$(s) + heat $\longrightarrow$ CaO(s) + CO$_2$(g). Heat must be supplied for it to proceed. This reaction is:
Aendothermic
Ba displacement reaction
Cexothermic
Da combination reaction
Answer & Solution
Correct answer: A. endothermic
1. The equation shows 'heat' on the reactant side, meaning heat is taken in.
2. A reaction that absorbs or requires heat to proceed is endothermic.
3. An exothermic reaction would show heat released on the product side, the opposite.
4. It is a decomposition (one reactant to two products), not displacement or combination, so those options are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.48_
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