alleryQuicklime (CaO) reacts vigorously with water to form slaked lime. This reaction is:
AEndothermic
BPhotochemical
CReversible
DExothermic
Answer & Solution
Correct answer: D. Exothermic
1. CaO + H₂O → Ca(OH)₂ + heat — slaking of lime.
2. The reaction RELEASES significant heat — exothermic.
3. Used in white-washing walls (Ca(OH)₂ slowly absorbs CO₂ to form a CaCO₃ film).
_Source: syllabus Science Ch 1 §1.2.1 Exothermic example_
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