Calcium hydroxide $(C a (O H)_{2})$ in water is used for:

white-washing

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preparing ammonia, caustic soda and bleaching powder

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reducing the activities of the soil

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all of the above purposes

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Solution

The correct option is B all of the above purposes
Calcium hydroxide is also known as slaked lime.
A. It is used as an ingredient in whitewash, mortar and plaster.
B. ${2 N H}_{4} C l + C a {(O H)}_{2} \to {C a C l}_{2} + {2 N H}_{3} ↑ + {2 H}_{2} O {N a}_{2} {C O}_{3} + C a {(O H)}_{2} \to {C a C O}_{3} + 2 N a O H (c a u s t i c s o d a) {C l}_{2} + C a {(O H)}_{2} \to {C a O C l}_{2} + H_{2} O$
$C a O C l_{2}$ causes bleaching action of Ca.

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