Question

slaked lime is used for white washing after two or three days of white washing it gives shiny finish to walls due to the formation of the compound

Answer 1

Solution used to white wash the walls is Quick lime(CaO) and when it is mixed with slaked lime [Ca(OH)2]. When this paste is used for white washing it combines with atmospheric CO2 to form calcium carbonate (CaCO3) which gives it a shiny texture. 

Answer 2

Calcium carbonate which is, in chemical formula CaCOз gives the shiny texture to the walls.