Question

Give the reason for
A. Shiny finish appears on the walls afterc2-3days of white washing.

Answer 1

Calcium hydroxide reacts slowly with the carbon dioxide in the air to form a thin layer of calcium carbonate on the wall which gives a shiny finish to the wall.
Equation:- Ca(OH)2 (aq) + CO2(g) ----> CaCO3(s) + H2O