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) ?
1
A - O2; B - CaCO3
2
A - CO2; B - Ca(OH)2
3
A - O2; Ca(OH)2
4
A - CO2; B - CaCO3
5
None of the above