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We know that slaked lime (produced by mixing water and calcium oxide) is used for white washing the walls.

CaO + H2O ----> Ca(OH)2

This calcium hydroxide when reacts with Carbon di oxide in air forms a thin layer of Calcium carbonate and water is evaporated (this process takes two to three days).

Ca(OH)2 + CO2 ---> CaCO3 + H2O

property of calcium carbonate--> It gives shinny finish

Therfore the walls shines after two of three days of white washing

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11y ago

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