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Assertion: After white washing the walls...

Assertion: After white washing the walls, a shiny white finish on walls is obtained after two to three days.
Reason: Calcium Oxide reacts with Carbon dioxide to form Calcium Hydrogen Carbonate which gives shiny white finish.

A

Both A and R are true and R is the correct explanation of A.

B

Both A and R are true but R is NOT the correct explanation of A.

C

A is true but R is false.

D

A is false and R is true.

Text Solution

Verified by Experts

The correct Answer is:
C
Calcium hydroxide is present in whitewash. It 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 white washing. Hence the shiny white finish appears after two to three days on the walls.
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