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Question

Solution of which of the following bases is used for whitewashing walls:
$N a O H$
$K O H$
$N H_{4} O H$
$C a (O H)_{2}$

A

K O H

B

N H_{4} O H

C

N a O H

D

C a (O H)_{2}

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Solution

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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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