Following are the answer to this question:
Explanation:
(1) Calcium oxide (CaO) is also referred to as quicklime. It is the solution for the substance used for whitewashing. Â
Whenever it reacts with water () and absorbs carbon dioxide (), it then formed calcium carbonate (), which produced a hard laminate on the walls, to first be whitened by the production of calcium hydroxide (CaOH). Â
(2) Slackened lime or calcium hydroxide arises whenever the fast limestone reacts with water.