Quicklime $(CaO)$ reacts with water to form slaked lime ${Ca(OH)}_{2}$ . During this process:

Heat is absorbed

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Heat is released

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Heat is absorbed and then released

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Heat is neither absorbed nor released

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Solution

The correct option is B 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:
$CaO (s) + H_{2} O (l) ⟶ {Ca(OH)}_{2} (s) + Heat$

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