Question

shiny finish appears on the walls after two -three days of white washing​

Answer 1

Answer:

in whitewash calcium hydroxide is present. Calcium hydroxide reacts slowly with the carbon dioxide in air to form a thin layer of calcium carbonate on the walls. calcium carbonate us formed after two to three days of whitewashing and gives a shiny finish to the wall.

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Answer 2

Answer:

Ca(OH)2 +CO2 ————> CaCO3 + H2O

Walls appears shiny because of CaCO3 formation.