A solution of a substance 'X' is used for white washing. Name the substance 'X' and write its formula.

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Solution

The solution of the substance used for whitewashing is calcium oxide also called quicklime with the chemical formula CaO.
So CaO is the substance X.
Quicklime is used for whitewashing as it produces calcium hydroxide Ca(OH)₂ when it reacts with water (H₂O) and absorbs carbon dioxide (CO₂) from the environment, as a result, it produces calcium carbonate (CaCO₃) which creates a hard coating on the walls.
It forms slacked lime or calcium hydroxide when the quick lime reacts with water.
The chemical reaction for the same is given below.
CaO _(s) + H₂O _(l) → Ca(OH)_2(aq).

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