Quicklime $(CaO)$ reacts with water to form slaked lime ${[Ca(OH)}_{2}]$ . Which of the following observations is true for the reaction?

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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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 an enormous amount of heat. Hence, the reaction is exothermic in nature.

The reaction involved is:
$CaO(s) + H_{2} O(l) ⟶ {Ca(OH)}_{2} (s)$

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