Fill in the blank with the most appropriate option.

Quicklime reacts with water to form ______.

This question was previously asked in
RRB ALP Previous Paper 20 (Held On: 30 Aug 2018 Shift 2)
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  1. limestone
  2. slaked lime
  3. chloride of lime
  4. chalk powder

Answer (Detailed Solution Below)

Option 2 : slaked lime
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Detailed Solution

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The correct answer is slaked lime.

  • Quicklime (CaO) reacts with water to form slaked lime {Ca(OH)2}.
  • The addition of a limited amount of water to quick lime is called slacking of lime.
  • When Calcium oxide is mixed with water it forms Calcium Hydroxide.
  • The above reaction can be written as
    • ⇒ CaO + H2O → Ca(OH)2
  • Calcium Hydroxide is used in the preparation of Mortar.

Additional Information

Common Name

Chemical formula/Compound name

Lime Stone

CaCO3/Calcium Carbonate

Chloride of Lime

Ca(OCl)2/Calcium Hypochlorite

Chalk Powder

CaCO3/Calcium Carbonate

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