Solution of which of the following bases is used for whitewashing walls:
NaOH
KOH
NH4OH
Ca(OH)2
A
KOH
B
NH4OH
C
NaOH
D
Ca(OH)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.
Ca(OH)2(aq)+CO2(g)⟶CaCO3(s)+H2O(l)
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