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Q.

Which of the following compounds is used for whitewashing?

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a

CaO

b

Ca(OH)2

c

Ca(NO3)2 

d

CaCO3

answer is C.

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Detailed Solution

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Explanation:

Calcium hydroxide (Ca(OH)₂), commonly known as slaked lime, is used for whitewashing. When mixed with water, it forms a paste that can be applied to surfaces for whitening and disinfecting purposes. This compound reacts with carbon dioxide in the air to form calcium carbonate, which gives the whitewashed surface its characteristic white color.

The correct answer is c. Ca(OH)₂ (Calcium hydroxide).

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