How can slaked lime be prepared from quick lime?

By adding water to quick lime

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By adding water to Calcium carbonate

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By adding water to calcium chloride

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By heating quick lime

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Solution

The correct option is A By adding water to quick lime
The addition of limited quantity of water breaks the lumps of lime. This process is called as slaking of lime.
$C a O + H_{2} O \to C a (O H)_{2}$

Theory
Calcium Hydroxide or slaked lime $C a (O H)_{2}$ :
Preparation:
By adding water to quick lime, Cao
$C a O + H_{2} O \to C a (O H)_{2}$
Properties:
It is a white amorphous powder.
Sparingly soluble in water. An aqueous solution is called lime water and the suspension of slaked lime in water is called milk of lime.
When $C O_{2}$ is passed through lime water, it turns milky due to the formation of $C a C O_{3}$ .
$C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$
On passing excess of $C O_{2}$ , the precipitate dissolves to form $C a (H C O_{3})_{2}$ .
$C a C O_{3} + C O_{2} + H_{2} O \to C a (H C O_{3})_{2}$ .
Milk of lime reacts with chlorine to form hypochlorite.
$2 C a (O H)_{2} + 2 C l_{2} \to C a C l_{2} + C a (O C l)_{2} Bleaching powder + 2 H_{2} O$
Uses:
In the preparation of mortar, a building material.
Used in whitewash due to its disinfectant nature.
Used in glassmaking, in the tanning industry, for the preparation of bleaching powder, and for purification of sugar.

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