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Question

Quicklime (CaO) reacts with water to form slaked lime Ca(OH)2. During this process:
  1. Heat is released
  2. Heat is absorbed and then released
  3. Heat is neither absorbed nor released
  4. Heat is absorbed


Solution

The correct option is A Heat is released
Quicklime (calcium oxide, CaO) on combining with water, gets converted to slaked lime (calcium hydroxide, Ca(OH)2) with the liberation of the enormous amount of heat. Hence, the reaction is exothermic in nature.

The reaction involved is:
CaO (s)+H2O (l)Ca(OH)2(s)+Heat

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