Question

Quicklime is used to whitewash walls of the house, which of the following is chemical formula of it?
(a) CaCO3
(b) Ca(OH)2
(c) Cao
(d) None of these.​

Answer 1

Quicklime is used to whitewash walls of the house, which of the following is chemical formula of it?

----- (c) Cao

• CaO is also known as calcium oxide.

(1) After mixing Cao with water gives calcium hydroxide.

$\rm CaO + H_2O \to Ca(OH)_2$

$\rm Ca(OH)_2 = Calcium \: hydroxide$

(2) After passing calcium hydroxide with Co2 gives Calcium carbonate.

$\rm Ca(OH)_2 + CO_2 \to CaCO_3 + H_2O$

$\rm CaCO_3 = calcium\: carbonate$

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Answer 2

CaO is known as QUICK-LIME.

VARIOUS USES OF THIS CHEMICAL:

• It is used extensively to white-wash the walls of the house.

• It is also used in production iron and steel in factories.

• Similarly, it can also be used for production of paper & pulp. They are also used in treatment of water.

• CaO is also used in preparation of bleaching powder (Calcium Oxy-Chloride), an disinfectant.

• It is also used to prepare porcelain glass and to treat acidic soils by providing a alkaline environment.

$\star$ Hope It Helps.