Question

14
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.

Answer 1

Answer:

a is true but r is false .........

Answer 2

Answer: Here "Assertion: After white washing the walls, a shiny white finish on walls is obtained after three days" is true but the given "Reason: Calcium Oxide reacts with Carbon dioxide to form Calcium Hydrogen Carbonate which gives shiny white finish" is false.

Explanation:

Reason is false: In whitewash, calcium hydroxide is present. A thin layer of calcium carbonate is formed on the walls as a result of its gradual reaction with airborne carbon dioxide. After washing whites for two to three days, calcium carbonate forms. Thus, the brilliant white finish on the walls shows after two to three days.
What is lime? The main components of lime, an inorganic calcium-containing substance, are oxides and hydroxides, typically calcium oxide and/or calcium hydroxide.
As a byproduct of coal seam fires and in altered limestone xenoliths in volcanic ejecta, calcium oxide is also known by this term. Lime is a mineral which has chemical formula CaO.The meaning of the word "lime" derives from its early use as mortar in construction.

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