Solution of which of the following bases is used for whitewashing walls:

N a O H

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K O H

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N H_{4} O H

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C a (O H)_{2}

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Solution

The correct option is D $C a (O H)_{2}$
Calcium hydroxide reacts slowly with the carbon dioxide in the air to form a thin layer of calcium carbonate on the walls. Calcium carbonate is formed after two to three days of whitewashing and gives a shiny finish to the walls.

$C a (O H)_{2} (a q) + C O_{2} (g) ⟶ C a C O_{3} (s) + H_{2} O (l)$

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N H_{4} O H, C a (O H)_{2}, N a O H, K O H, M g (O H)_{2}

A solution of a substance 'X' is used for whitewashing.
(i) What is X?
(ii) Write the reaction of the substance x with water.

C a {(O H)}_{2}

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