Question

A solution of a substance "X" is used for white washing. Name the substance "X" 1.CuO,2.CaCo3,3.Ca(OH)2,4.CaO​

Answer 1

Answer:

Substance X is quick lime (CaO) which is used for white washing.

Answer 2

Answer: 4. Cao

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