Question

which one of the following is used in the whitewashing of walls.(1) calcium oxide mixed with water. (2)calcium carbonate mixed with water. (3)calcium sulfate mixed with water. (4)sodium chloride mixed with water​

Answer 1

Answer:

Quicklime is used for whitewashing as it produces calcium hydroxide (CaOH) when it reacts with water (H2O) and absorbs carbon dioxide (CO2) from the environment, as a result, it produces calcium carbonate (CaCO3) which creates a hard coating on the walls.