Which one of the following is an example of endothermic reaction?
CaO(s) + H₂O(l) → Ca(OH)₂(aq)
CaCO₃(s) → CaO(s) + CO₂(g)
C(s) + O₂(g) → CO₂(g)
CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l)
Answer is Wrong!
Answer is Right!
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UPSC CAPF – 2021
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.