Setting of mortar is the result of reaction between slaked lime and $C O_{2}$ of air.

True

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False

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Solution

The correct option is A True
The setting of mortar is a time-consuming process that involves a chemical reaction of quicklime, $C a O$ with the carbon dioxide and water of the atmosphere, forming $C a C O_{3}$ , and $C a (O H)_{2}$ respectively as :
$C a O + H_{2} O \to C a (O H)_{2}$
$C a O + C O_{2} \to C a C O_{3}$

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C a C O_{3}

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