Which of the following is used as a raw material for white washing walls?

Quick lime

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Slaked lime

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Calcium carbonate

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Washing soda

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Solution

The correct option is A Quick lime
A solution of $C a (O H)_{2}$ (slaked lime) produced by the reaction of $C a O$ (quick lime) with water is used for white washing walls.
Calcium hydroxide reacts slowly with the carbon dioxide in air to form a thin layer of calcium carbonate on the walls.
$C a O (s) + H_{2} O (l) \to C a (O H)_{2} (a q .)$
$C a (O H)_{2} (a q .) + C O_{2} (g) \to C a C O_{3} (s) + H_{2} O (l)$

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