Assertion (A): A white washed wall develops a coating of calcium carbonate after a few days.
Reason (R): Calcium oxide on the wall reacts slowly with carbon dioxide in the air.
- Slaked lime [Ca(OH) 2 ] is used to white wash walls.
- When it is exposed to air, it reacts with the Carbon Dioxide to form Calcium Carbonate which gives the walls white colour .
Since it is Calcium Hydroxide and not Calcium Oxide reacting,
The correct answer is C .
A is true but R is false.