An endothermic reaction is a reaction that absorbs heat from its surroundings. A) CaO(s) + H₂O(l) → Ca(OH)₂(aq) (Slaking of lime) is a highly exothermic reaction, releasing significant heat. B) CaCO₃(s) → CaO(s) + CO₂(g) (Decomposition of calcium carbonate) requires heating to occur, meaning it absorbs heat from the surroundings, making it an endothermic reaction. C) C(s) + O₂(g) → CO₂(g) (Combustion of carbon) is an exothermic reaction, releasing heat and light. D) CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) (Combustion of methane) is an exothermic reaction, releasing a large amount of heat.
Which one of the following is an example of endothermic reaction?
Asked in UPSC CAPF 2021 · Topic: Physical and Chemical Changes, Solution (Energy Changes in Chemical Reactions (Exothermic and Endothermic Processes))
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Answer: B. CaCO₃(s) → CaO(s) + CO₂(g)
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