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Question 880006
JEE Chemistry · Hard

s-Block Elements: JEE Main MCQ

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JEE MainHardQuestion 880006

Question

Quick lime (CaO) reacts with water to give:
  1. A
    Ca(OH)₂ (slaked lime) with evolution of heat
    Correct
  2. B
    CaCO₃
  3. C
    Ca + H₂
  4. D
    CaO + H₂O (no reaction)

Correct answer

Ca(OH)₂ (slaked lime) with evolution of heat

Explanation

CaO + H₂O → Ca(OH)₂ + heat (exothermic). This is slaking of lime. Ca(OH)₂ is slaked lime (or milk of lime when suspended in water). Used in plastering, water treatment, and making bleaching powder.

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