Home › NDA › Chemistry › Chemical Reactions and Equations › Quicklime (CaO) reacts vigorously with water to …
Quicklime (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: NCERT Class 10 Science Ch 1 §1.2.1 Exothermic example_
Related questions
Clear limewater turns milky white when a gas is bubbled through it. Which gas was in the bMilk left standing for a few days tastes sour. Which process has produced that taste?During a chemical reaction, what happens to the atoms of the reactants?What do we call the substances that are present before a reaction takes place?What happens to the starting substances during a chemical reaction?A reducing agent in a redox reaction is the substance thatRespiration, in which glucose combines with oxygen to release energy, is best described asThe decomposition of water into hydrogen and oxygen on passing electric current is called