Calcium oxide reacts vigorously with water to produce slaked lime whose solution is used for white-washing walls. This slaked lime reacts with component (A) in air to form a thin layer of component (B) to give a shiny finish. What are the components (A) and (B) ?

Calcium oxide reacts vigorously with water to produce slaked lime whos

1.	Calcium oxide reacts vigorously with water to produce slaked lime whose solution is used for white-washing walls. This slaked lime reacts with component (A) in air to form a thin layer of component (B) to give a shiny finish. What are the components (A) and (B) ?
A.	A - O2; B - CaCO3
B.	A - CO2; B - Ca(OH)2
C.	A - O2; Ca(OH)2
D.	A - CO2; B - CaCO3
Answer» E.